Highway Area Research Articles

ГЕОЭКОЛОГИЧЕСКИЕ ПРОБЛЕМЫ ПРИРОДНО-ТЕРРИТОРИАЛЬНОГО КОМПЛЕКСА В ОБЛАСТИ ВЛИЯНИЯ ПРОМЫШЛЕННЫХ ПРЕДПРИЯТИЙ ГОРОДСКОГО ОКРУГА ГОРОДА САЛАВАТ РЕСПУБЛИКИ БАШКОРТОСТАН

An ecological substantiation of sustainability of geoecosystems at the territory of one of the centers of the petrochemical complex in the Republic of Bashkortostan was carried out on the example of district of Salavat. The researchers used the statistical data from the investment passport of the urban district of Salavat to rank the lands according to the degree of anthropogenic load and calculate the environmental stress, ecological fund, natural protection coefficient of the studied territories on the basis of B.I. Kochurov and E. V. Grivko methodology (Kochurov, 2013; Grivko, 2016). The last indicator was considered as an indicator of sustainability. The main contributors to air pollution are the facilities of the industrial sites of “Gazprom Neftekhim Salavat, LLC” and “Salavatsteklo, JSC”. The laboratory tests prove that the priority contaminants contained in the Belaya River are bicarbonate ions, among metals – calcium ions as well as organic substances. On the basis of the obtained data water pollution index was calculated for 10 priority impurities: bicarbonate ion, chloride ion, suspended solids, ions of calcium, magnesium, cobalt, lead, petroleum products and organic substances. Biotesting of samples of soil and surface waters of the Belaya River was carried out on watercress as an additional research method. The analysis made it possible, with a high degree of probability, to classify the concentration of industrial enterprises and their infrastructure on a narrow fifteen-kilometer strip along the left bank of the Belaya River as a leading geoecological problem of the studied territory. Such density of anthropogenic objects increases unsustainability of the natural-territorial complex. To create a positive ecological and economic balance, it is recommended to equip 10 % (1062 hectares) of land occupied by industrial enterprises with denser green spaces. Moreover, 6 % (637 hectares) of the arable land that is part of the urban district should be transferred to the category of pastures and hayfields, and 5 % (531 hectares) of roadside areas of the main highways should be equipped with seven-to-ten-row green belts. These simple measures can improve the situation and transfer the studied territory of the urban district of Salavat from an unsustainable state to a moderately sustainable one.

Evaluation of stability of high rockfill embankment based on fuzzy mathematics

High rockfill embankment is widely applied to high-grade highways in mountainous areas, and its stable operation can significantly promote traffic and economic development. In this study, a stability evaluation model of high rockfill embankment was constructed based on fuzzy mathematics theory to realize effective and rapid evaluation. Considering representativeness and easy operability, 5 level-1 factor indexes and 16 level-2 factor indexes were determined from different perspectives of embankment fillers, slope conditions, hydraulic conditions, slope protection, and other factors. Weights of different factor indexes were allocated using analytic hierarchy process and all factor indexes were quantified and classified using the fuzzy statistical method according to stability level. Reliabilities of factor indexes were combined with reliability theory for analysis. Finally, the reasonability of the proposed fuzzy evaluation model was verified through application in the high rockfill embankment engineering on the secondary highway of the National Highway 316 from Xunyang to Ankang in Shaanxi Province, China. Results demonstrate that the reliability of this high rockfill embankment is 0.8671 and the final score of the evaluation system is 73.1619, indicating stability. Therefore, the proposed fuzzy evaluation model is reasonable and feasible to evaluate stability of high rockfill embankment, and can provide references for future design.

Florida Highway Infrastructure: Relationship Between Highway Funding Allocations and Demographic Composition

Highways serve as an integral part of American metropolises, as they allow social and economic interactions between diverse populations to occur. Recently, concerns regarding funding allocation for American highways in geographical areas of interest have been brought up. Some cities possess poorly maintained freeways, while others may not even have access to such expressways at all. Using Central Florida as a case study, our research aims to identify relationships between road funding and the demographics surrounding road infrastructures of interest using publicly available data from the U.S. Census and the Florida Department of Transportation. To do so, we found the correlation between highway funding data and demographic data by visualizing and mapping out both sets of data using R Studio and Tableau. We discovered that areas with a lower minority population do not necessarily receive increased funding. We also discovered that highways historically have a greater presence in higher-income neighborhoods. Ultimately, our findings will provide an empirical approach to understanding highway budgeting and mapping, which will be critical in developing socioeconomic awareness with respect to infrastructure and its relationship with demographics throughout the United States.

Discussion on Landscape and Greening Technology of Highway Structural Tunnel Entrance

Highway tunnel entrance is not only the exposed part of mountain in the tunnel engineering, but also an integral part of the highway breaking through the mountain. On the premise of ensuring the safety of tunnel entrance, it is important to realize the unity of safety and practical “stability” and landscape greening “beauty” of the expressway tunnel through reasonable aesthetic landscape greening design. In combination with the topographic and geomorphological conditions as well as the regional and humanistic conditions of the highway tunnel portal area, this paper introduces the cultural landscape and plant greening engineering of highway tunnel entrance by reference to the successful experience of tunnel entrance landscape greening, and puts forward the requirements for landscape and greening technology of highway tunnel entrance in accordance with the provisions of relevant regulations.

ФУНКЦИОНИРОВАНИЕ И ДИНАМИКА ЛАНДШАФТОВ ПРИ ПРОЕКТИРОВАНИИ АВТОМОБИЛЬНЫХ ДОРОГ В ГОРНЫХ УСЛОВИЯХ

Introduction. Roads, as linear engineering structures in mountainous conditions for the sake of traffic safety, should provide a smooth interface and their harmonious combination with the surrounding landscape with the use of longitudinal slopes and radii on curves that reduce accidents and injuries. Anthropogenic intervention on the mountain natural landscape, for the purpose of road construction, is not always safe, because weak soils come into dynamics and the functioning of the road is complicated. For this , it is necessary to conduct a spatial analysis and an integrated approach to the issue, covering all aspects of landscape design of the road to eliminate negative consequences. The essence of the question. The design of highways in mountainous areas without observing the landscape principles of safe operation and with less dynamic shifts of the roadbed leads to a violation of the relief forms, with the implementation of large volumes of earthworks necessary to ensure the projected slope. Research methods. In the process of writing the article, the following methods were used: analysis - in the search and analysis of literature on the subject; observation and comparison in the study and selection of the optimal option. Conclusions: 1. When designing highways in mountain landscapes, it is necessary to find a harmonious combination of the functioning of the road and the landscape itself. 2. A scientifically based analysis and correct choice of landscape design elements in the operation of the road will reduce the dynamics of slope phenomena, the number of accidents, the cost of road maintenance, which contribute to improving safety on mountain roads.

Performance evaluation of a vehicular edge device for customer feedback in Industry 4.0

<p>Industry 4.0 is the term used to specify the current industrial revolution, not only from a technological point of view but also from economical, sociological and strategical points of view. The revolution involves several traditional economic sectors, as is the case with the industrial ecosystem. The main benefits are related to creating value during the entire product lifecycle and in terms of customer feedback, which is particularly relevant to the automotive industry. Its disruptive diffusion is due to various enabling technologies, such as the Internet of Things (IoT), and, as such, it is a vision rather than a technological step forward. Thus, this paper investigates a performance evaluation of an Edge OBD-II device, which collects data from vehicles in an autonomous way in order to provide customer feedback and tracking. The metrics evaluated were different sets of OBD-II Parameter IDs (PIDS), responsiveness, driver behaviour and CO<sub>2</sub> pollution estimates. The experiments were performed using three vehicles in urban and highway areas in the city of Natal, Brazil. For validation purposes, the results obtained from the vehicles were compared with an OBD-II Emulator, which demonstrated the accuracy of the experiments.</p>

English

BACKGROUND Road Traffic Injuries (RTA's) are a major but neglected global public health problem requiring concerted efforts for effective and sustainable prevention. Road traffic accident is one of the major causes of morbidity and mortality in developing countries, including India. Srikakulam is the northern district in Andhra Pradesh state which has 194 kilometres of National Highway (NH) passing through it from Ichapuram to Pydibheemavaram. Frequent median openings, poorly designed access roads from the adjacent areas of highways and lack of effective enforcement to control wrong side vehicular movements on NH16 have led to an increase in number of road accidents in this region. We wanted to study the demographic distribution of cases, assess the nature and cause of deaths certified after post-mortem examinations, and evaluate the pattern and distribution of injuries associated with road traffic accidents. METHODS It is a record-based study, a total of 422 autopsies done in the year 2019 were studied, of which 131 were due to RTA's. Data regarding 131 RTA's was analysed using the records available with the Forensic Medicine department. Institutional Ethical Committee (IEC) approval was taken. RESULTS In our study, 78 % were men, and 22 % were women. 41 - 60 years age group showed the highest number of victims (38 %) (49). Head injuries were most common (54.6 %), followed by multiple injuries (27.6 %) and chest injuries (8.4 %). The study reported more accident-related deaths during the month of May (22 %), followed by April (11.4 %). CONCLUSIONS Head injuries and subdural & sub arachnoid hematoma are the leading causes of death from RTAs. KEYWORDS Autopsy, Cause of Death, Fatal Road Traffic Accidents, Injuries, Pattern of Injuries

Research on High-Risk Road Sections Identification and Driving Early Warning System in Mountainous Areas Based on Edge-Cloud Integration Technology

The operation of mountainous highways is of high risks and the emergency rescue after an accident is of great difficulty. Affected by the mountains, river densities and other topographic features, highways in mountainous areas are characterized by linear complexity, long span bridge and tunnel group, frequent transitions among subgrade-bridge-tunnel, steep slopes, complex setup of interchange, changeable climate and easy occurrence of secondary accident, etc. In the 5G Internet era, the artificial intelligence theories and methods continue to deepen. To fully integrate emerging information technologies such as computer vision and Edge-cloud Integration to establish a high-risk road sections identification and driving early warning system in mountainous areas will help drivers to drive, promote the intellectualization of mountainous highways, and improve the safety of traffic operation management. In this paper, the Edge-cloud Integration technology and the navigation map data, combined with vehicle vision, are used to establish an early traffic warning system. This system collects and shares data through vehicle-mounted terminal and navigation map, uses Matter-element Model to identify and measure risk in cloud, and feeds back the results to vehicle-mounted terminal. If the identification result shows that it is the high-risk sections, combined with the navigation map, there will be a voice warning to ensure driving safety.

Optimal and prototype dimensioning of 48V P0+P4 hybrid drivetrains

This paper presents a virtual toolchain for the optimal concept and prototype dimensioning of 48 V hybrid drivetrains. First, this toolchain is used to dimension the drivetrain components for a 48 V P0+P4 hybrid which combines an electric machine in the belt drive of the internal combustion engine and a second electric machine at the rear axle. On an optimal concept level, the power and gear ratios of the electric components in the 48 V system are defined for the best fuel consumption and performance. In the second step, the optimal P0+P4 drivetrain is simulated with a prototype model using a realistic rule-based operating strategy to determine realistic behavior in legal cycles and customer operation. The optimal variant shows a fuel consumption reduction in the Worldwide harmonized Light Duty Test Cycle of 13.6 % compared to a conventional vehicle whereas the prototype simulation shows a relatively higher savings potential of 14.8 %. In the prototype simulation for customer operation, the 48 V hybrid drivetrain reduces the fuel consumption by up to 24.6 % in urban areas due to a high amount of launching and braking events. Extra-urban and highway areas show fuel reductions up to 11.6 % and 4.2 %, respectively due to higher vehicle speed and power requirements. The presented virtual toolchain can be used to combine optimal concept dimensioning with close to reality behaviour simulations to maximise realistic statements and minimize time effort.

Application of Machine Learning to Debris Flow Susceptibility Mapping along the China–Pakistan Karakoram Highway

The China–Pakistan Karakoram Highway is an important land route from China to South Asia and the Middle East via Pakistan. Due to the extremely hazardous geological environment around the highway, landslides, debris flows, collapses, and subsidence are frequent. Among them, debris flows are one of the most serious geological hazards on the Karakoram Highway, and they often cause interruptions to traffic and casualties. Therefore, the development of debris flow susceptibility mapping along the highway can potentially facilitate its safe operation. In this study, we used remote sensing, GIS, and machine learning techniques to map debris flow susceptibility along the Karakoram Highway in areas where observation data are scarce and difficult to obtain by field survey. First, the distribution of 544 catchments which are prone to debris flow were identified through visual interpretation of remote sensing images. The factors influencing debris flow susceptibility were then analyzed, and a total of 17 parameters related to geomorphology, soil materials, and triggering conditions were selected. Model training was based on multiple common machine learning methods, including Ensemble Methods, Gaussian Processes, Generalized Linear models, Navies Bayes, Nearest Neighbors, Support Vector Machines, Trees, Discriminant Analysis, and eXtreme Gradient Boosting. Support Vector Classification (SVC) was chosen as the final model after evaluation; its accuracy (ACC) was 0.91, and the area under the ROC curve (AUC) was 0.96. Among the factors involved in SVC, the Melton Ratio (MR) was the most important, followed by drainage density (DD), Hypsometric Integral (HI), and average slope (AS), indicating that geomorphic conditions play an important role in predicting debris flow susceptibility in the study area. SVC was used to map debris flow susceptibility in the study area, and the results will potentially facilitate the safe operation of the highway.

Research on Characteristics and Trends of Traffic Flow Based on Mixed Velocity Method and Background Difference Method

This research is conducted on the characters and trends of traffic flow in highway maintenance work areas under typical maintenance work forms. In order to improve the safety of the highway maintenance work area, a data monitoring method based on the combination of mixed speed measurement and background difference method were developed. During the on-site detection, the starting point of the warning zone, the starting point of the upstream transition zone, the starting point of the working zone, the midpoint of the working zone, and the six speed measurement sections of the working zone were collected at the end point and the end zone. In the video detection, the background subtraction was used, and the morphological denoting method and the connected domain analysis method were used to retain the vehicle foreground. After analyzing the connection domain and removing the wrong target, the vehicle target area is extracted from research. The research finally obtained the traffic flow characteristics of the start point of the warning zone, the start point of the upstream transition zone, the start point of the work zone, the midpoint of the work zone, the end point of the work zone, and the end point of the downstream transition zone. The study also obtained the traffic volume and the change trend of headway. The combination of mixed velocity method and background difference method is helpful for data monitoring in typical highway maintenance work areas. The measured data results are helpful for studying the distribution characteristics and trends of traffic flow in typical highway maintenance work areas.

Study on the Application of Expressway Construction Based on Sponge City Concept

<p>Currently, in the active trial stage, sponge city concept has been applied in many low-impact development facilities on expressways in China, but many applications are not widely used. From four angles of pavement, slope, interchange and service area of expressway, this paper explains the adverse effects brought by rainwater, and then gives, and it carries out scene analysis combined with actual engineering projects with some feasible application schemes. Finally, the concept of sponge city at present is summarized, and it is considered that the optimal planning and design can be made only after establishing a reliable mathematical model and carrying out quantitative analysis.</p>

Factors associated with traffic crashes on urban freeways

The majority of earlier works suggested that traffic fatalities in a rural section of highways are relatively higher than those observed in urban areas. However, the recent report released by the National Highway Traffic Safety Administration (NHTSA) described the trend that the urban area highway fatalities in the last four years are higher than the crashes that occurred on a rural section of the highway segments. In the present work, the key factors influencing fatal, non-fatal injury and property damage only crash on four and six-lane urban interstate highway segments are analyzed. A negative binomial regression approach was used for the analyses of the three crash categories, and a meaningful statistical interpretation of the developed model estimates are provided in terms of the incident rate ratio. The results of the study suggest that traffic volume, median type, and the number of lanes were factors associated with fatal, non-fatal injury, and property damage only crashes. All the categories of the horizontal and vertical geometries of the roadway segment were found to be critical factors influencing property damage only crashes. The results also showed that the effect of drivers’ gender was insignificant across the three crash categories.

Research and Application on the Key Technology of Ecological Route Selection in the Mountain Area of Northern Guangdong Province

Based on the express way from Huizhou to Qingyuan section in Guangdong province, this study used the “3S” technology to collect the eco-environmental factors in the mountain area of northern Guangdong province. By quantified analysis, various eco-environmental indexes were assigned and standardized. In addition, the analytic hierarchy process was used to set up the weight of respective index factor, as well as to establish the regional ecological evaluation criteria system of the mountain area in northern Guangdong province. It consisted of two primary criteria and ten secondary criteria. As a result, this method was proved to be an available method on route planning for highways in different areas, which was worthy of promotion and utilization.

Study of transportation density towards population economy in the Gajah Mada Street, Kaliwates Sub District, Jember District

This study aims to determine whether there is a relationship between transportation density and the economy of the population on Jalan Gajah Mada, Kaliwates District, Jember Regency. The focus of this study is the density of transportation found on Jalan Gajah Mada and its impact on traders and pedicab drivers on the economic aspect. The research method used in this research is descriptive quantitative. Primary data were obtained from pedicab traders and pedicab drivers. Data collection techniques using observation and interview techniques. Data analysis techniques using descriptive analysis. The results showed that the density of transportation is dominated by motorcycle vehicles, where most of these motorbikes are from online transportation riders. Also, the highway is dominated by private cars and public transport such as lin. The population’s economy will increase due to congested transportation. This is due to the ease of access to shops close to the highway, so it becomes an attractive factor for buyers to buy souvenirs. The location of the shops that are easily accessible from the road affects economic improvement along the highway area. There is no relationship between transportation density and lack of buyers/passengers. Because over time, the population will increase, and competition will be increasingly fierce, and traditional vehicles will be replaced by modern vehicles that use technology in their applications. The more cars, the more people take the opportunity to trade. Therefore, the economy remains stable, with more competition in the business world.

Ground Deformation in The Ciloto Landslides Area Revealed by Multi-Temporal InSAR

Landslides are one of the natural hazards that occur annually in Indonesia. A continuous geodetic observation in the landslide prone area is essential to support the precautionary measures. Because of its hilly topography, torrential rainfall and landslide history, the Ciloto district in Indonesia has been affected by ground deformation for an extended period of time. The purpose of our study is to detect significant movement and quantify the kinematics of its motion using the Interferometric synthetic aperture radar (InSAR) time series analysis and multi-band SAR images. We utilized the small baseline SDFP technique for processing multi-temporal SAR data, comprising ERS1/2 (1998–1999), ALOS PALSAR (2007–2009), and Sentinel-1 (2014–2018). Based on the detected deformation signal in the Ciloto area, the displacement rates are categorized as very slow movements. Two active main landslide zones; the Puncak Pass and the Puncak Highway area, which show the trend of slow movement progressively increasing or descreasing, were detected. The integration of the velocity rate between InSAR results and ground observations (e.g., terrestrial and GPS) was conducted at the Puncak Highway area from the temporal perspective. Using the polynomial model, we estimated that the area had cumulatively displaced up to −42 cm for 25 years and the type of movements varied from single compound to multiple rotational and compound.

Park and Pool Lots’ Impact on Promoting Shared Mobility and Carpooling on Highways: The Case of Slovenia

Dispersed settlement areas (e.g., Slovenia) result in lower development of fixed public transport lines and thereby car-dependent lifestyles. To avoid congestion inside the cities and on highways in these areas, shared mobility modes e.g., carpooling, is one of the effective solutions, increasing the occupancy of personal vehicles. However, passenger pick-up and drop-off locations still remain an important challenge for carpool users and transport officials. As a collection point for carpooling, we can consider “park and pool (P+P)” lots near highways’ interchanges. This study aims to examine the impacts of P+P lots near interchanges on carpooling behavior of users and on improving sustainable mobility on highways in such dispersed settlement areas. To do so, we employed a field survey, incorporated the P+P lots into the mode choice model, and examined different scenarios using the macroscopic transport model. It is found that factors such as travel cost, public transport service limitations, and improved parking facilities impact highway users’ mode choice. Sixty percent of respondents are willing to leave their car in P+P lots near interchanges. The results also show that P+P lots can increase the number of carpool users. It causes remarkable savings in terms of operating and external costs because of the reduction in total distance and time travelled by personal vehicles as well as parking demand reduction in cities. At the moment, especially in Central Europe, it is easier to invest in a “demand reduction” infrastructure than to increase the capacity of infrastructure. Therefore, P+P lots could be a “win-win” situation for both users and operators.

Stabilization of Peat Soils Using Petrasoil with Cement Viewed From CBR Value and Free Compressive Strength Value Of Soils

Peat soils are organic soils that physically and technically do not meet the requirements and conditions in construction work because peat soils have very high water content and compressibility and have low soil bearing capacity. For various reasons and considerations, work construction on peat deposits is often forced to be carried out, especially for the construction of highways. So one way to overcome this problem needs to be improved by stabilizing the soil. Peat soil stabilization includes trying to add a mixture of Petrasoil and cement.In this study, peat soils were taken in the Ogan Ilir Eastern Highway area and then stabilized and tested using physical and mechanical properties tests such as Specific Gravity, Atterberg Limits, Sieve Analysis, Hydrometers, Standard Compaction, California Bearing Ratio (CBR), and Free Compressive Strength. The variation additional cement content by 2.5%; 7.5%; 12.5%; 17.5%, while the Petrasoil mixture is by comparison (1:75). From the results of the optimum moisture content through the compaction test, the California Bearing Ratio (CBR) and free compressive strength tests were performed to see the effect of each addition of cement and Petrasoil on peat soils.The results showed improvements in physical properties and increased California Bearing Ratio (CBR) value and free compressive strength, meaning that the soil becomes more stable.

EFFECTS OF PHYSICAL AND MECHANICAL PROPERTIES OF RESIDUAL SOIL ON SLIDING AREA AT BUNDU TUHAN, SABAH, MALAYSIA

The study of the earth mass movement has long been regarded as one of the most important and interesting aspect of engineering geology and geotechnical engineering, which the designers and planners from the private and public sectors address when implementing the initial stage of urban and rural development projects. This involves highways and infrastructures construction and land use planning among the others. Failure to appreciate the problems relating to mass movements of earth material could lead to damage of man made structures and even the loss of lives. These studies focused on the mass movement in Bundu Tuhan to Kundasang highway area approximately 84 km to 96 km from Kota Kinabalu city, Sabah, one of the most vulnerable to mass movements occurrence in west coast of Sabah. It is bounded by longitude line E 116o 31.592’ to E 116o 36.183’ and latitude line N 06o 00.269’ to N 05o 57.610’. The main objectives of this study are; 1) to map and locate the landslides in the study area; and 2) to study the mechanism and the influence of geological factors causing the mass movement. Geology of the study area and its surrounding is hosted mainly by three sedimentary rock formations: Trusmadi Formation (Palaeocene to Eocene age), Crocker Formation (Late Eocene to Early Miocene age) and Pinousuk Gravel (Upper Pleistocene to Holocene age). These three geologic formations dissected by numerous geological lineaments structural produced by a complex tectonic history of multi phase folding and thrust, normal and reverse faulting. These tectonic setting reduce the physical and mechanical properties of the soil and produced intensive displacement in substrata resulting in intensive high degree of weathering processes. The weathered materials are weak and cause sinking, subsidence and sliding due to high pore pressure subjected by both shallow and deep groundwater. Evaluation 10 boreholes data in study area indicated that the groundwater table in study area is shallow and range 1.9 meter to about 11.3 meters. The groundwater in study area fluctuate drastically even within short period. Sand and gravel layer with variable thickness defined the major shallow aquifers within the top weathered materials while the highly fracture sedimentary rocks defined the major deep aquifers. Most of the aquifer within top unconsolidated weathered material is under unconfined condition. Most of significant aquifers within the sedimentary rocks are sandstones. The sandstones generally fracture and contain coarse sediments, which increase the permeability. Geologic and geotechnic evaluation of the study area indicates that the mass movement take place when slope materials are no longer able to resist the force of gravity. These decrease the shear resistance resulting mass movement, which is due to internal and external factors. Internal factors involve some change in either physical or chemical properties of the rock and soil. External factors involve increase of shear stress on slope, which usually involves a form of disturbance that is induced by man. The triggering mechanism in the study area most likely involves heavy rainfall causing water saturation of the slope material and loss of cohesion along rapture planes. The sheared shale, bedding and fault planes, and opening fractures are all structural weaknesses, which acting as pathways for water seepage, hastening the weakening and eventual mass movement in the study area. Development planning has to consider these hazards in order to counter their effect. An environmental management program should be implemented to prevent these losses. Geological and geotechnical studies will play a vital role in ground stability assessment that critical in public safety.

Study on the Distribution Law and Speed Limit of Night Speed in Expressway Maintenance Area

In order to reasonably determine the maximum and minimum vehicle speed limit values at night and ensure the driving safety in the maintenance area of expressway, the distribution law of vehicle speed at night in the maintenance area of expressway is studied. Based on the investigation of one-way lane closure construction in the four-lane maintenance area of expressway, the location speed of the main traffic control area in the night maintenance area is analyzed, and the average speed, 85% vehicle speed, the speed difference in different areas and the speed difference in heavy-duty vehicle(HDV) and light-duty vehicle(LDV) workshops are determined. The results show that the standard deviation of vehicle speed distribution from warning area to transition zone to construction area is obviously reduced, and the speed difference between HDV and LDV is also obviously reduced. Finally, according to the distribution characteristics of night speed, the night speed limit model of maintenance operation area is given, the speed limit values of different models are calculated respectively, and the night perceived speed model is used to modify the speed limit value.