Motor Vehicle Research Articles

Blunt Thoracic and Abdominal Aortic Injury in Multiple Trauma: A Case Report.

Blunt abdominal aortic injury (BAAI) is rare among traumatic aortic injuries, and further complications of blunt thoracic aortic injury (BTAI) have never been reported. A man in his 80s presented to our hospital following a motor vehicle accident. Pan-scan contrast-enhanced CT showed a thoracic aortic isthmus injury (Grade III), an abdominal aortic injury (Grade IV) with extravasation of contrast media at the level of the fourth lumbar vertebra. Endovascular abdominal aortic repair was performed on the same day and a thoracic endovascular aortic repair for BTAI was performed 11 days after admission. The patient had a good postoperative course and was discharged without complications. This report presented a rare case of BTAI complicated with BAAI. The timing of intervention for aortic injury should be determined based on urgency and other organ damage.

Modeling and Simulation of Hybrid Electric Vehicles for Sustainable Transportation: Insights into Fuel Savings and Emissions Reduction

Most motor vehicles have historically utilized Internal Combustion Engines powered by a fossil fuel. Despite the technological advancements in fuel-efficient engines, further improvements are required to reduce the effect of fuel costs and global warming. This study models and simulates Hybrid Electric Vehicles (HEVs) to evaluate their potential for fuel cost savings and emissions reduction compared to traditional vehicles. Using MATLAB® version R2023a Update 5 (9.14.0.2337262) Simulink version 10.7 (R2023a) and the Advanced Vehicle Simulator (ADVISOR) version 2003-00-r0116, the research examines Series and Parallel HEV configurations. The simulation explores various battery configurations, engine capacities, and power unit models to analyze their impact on energy utilization. The data, collected from the simulations, show significant fuel savings and emissions reduction with HEVs. The Parallel HEV configuration consistently saves fuel with fewer battery modules, while the Series HEV configuration performs better but requires more modules to maintain the system’s State of Charge.

Back to the Future: Revisiting Barometric Levelling

Abstract. Barometric levelling, traditionally employed in aviation, parachute jumping, and mountain climbing, has undergone a transformative shift with the technological advancement of state-of-the-art atmospheric pressure sensors. This evolution has rendered these sensors more accurate and affordable, broadening their applications within the realm of Intelligent Systems. The integration of barometric altimeter modules into electronic devices, coupled with GNSS and mapping systems, has significantly enhanced their versatility, making them complementary components in various consumer electronics like smartphones, watches, sports bands, bicycle computers, and motor vehicle tracking devices. Moreover, they play a pivotal role in emerging technologies such as drone mapping projects and modelling. This because of their capabilities of measuring elevations in GNSS denied areas such as caves, canyons, and tunnels. The significance of barometric levelling lies in its capacity to determine relative elevation between two points through the measurement of atmospheric pressure. This technique leverages the fact that atmospheric pressure decreases with increasing altitude, enabling the calculation of elevation differences by comparing pressure readings at different locations.In this study, 25 elevations within a 3 km radius were independently measured using barometric levelling, highlighting its practical usage. These elevations ranged from 2 m to 140 m. Readings of time of measurements, temperature, air pressure, and humidity were taken at each of these stations and were synchronized with the readings obtained from a fixed reference station of known elevation. The measurements at this reference station were carried out with an instrument with data logging capabilities, able to record relevant weather data at pre-established intervals of time without human intervention. The results of these measurements were compared to fixed reference stations of known elevation, and the subsequent differences were analysed. The study employed a portable weather monitoring instrumentation with data logging capabilities, emphasizing the importance of automated data collection practices. The comparison of the 25 elevation readings with true elevations, determined by conventional surveying methods, revealed an RMSE of +/- 0.49 meters, affirming the accuracy of barometric levelling.Additionally, a distance-dependent test demonstrated a predictable decrease in positional accuracy as the distance from a reference base station increased, providing valuable insights into the system's limitations. The barometric levelling tests presented here offer results that can inform future applications. The conclusions and recommendations derived from this study provide guidance for optimizing the use of barometric levelling within the broader landscape of Intelligent Systems.

Traumatic durotomy and entrapment of neural elements in a lumbar burst and laminar fracture diagnosed on preoperative imaging: illustrative case.

Traumatic dural lacerations can be caused by thoracolumbar burst fractures and, infrequently, can be associated with the entrapment of neural elements within a laminar fracture. The diagnosis of both is difficult to make on preoperative imaging, as the conditions are typically appreciated during surgical exploration. The authors present a case of traumatic durotomy with entrapment of neural elements in a laminar fracture that they believed could be appreciated on preoperative magnetic resonance imaging (MRI). A young male involved in a motor vehicle collision presented to the authors' trauma center with a lumbar burst and laminar fracture. Preoperative MRI demonstrated epidural hemorrhage and entrapment of neural elements within the laminar fracture, which was confirmed intraoperatively. The patient underwent a successful decompression, release of nerve roots, fusion, and recovery. Traumatic durotomy and entrapment of neural elements can occur after a traumatic spinal fracture, and a diagnosis made upon preoperative MRI can allow for effective preoperative planning. Clinicians should have a high index of suspicion for these pathologies when encountering certain fracture patterns and could therefore tailor the surgical approach to avoid further neurological injury during surgery. https://thejns.org/doi/10.3171/CASE24455.

Predictive Models of Brake Reaction and Steering of Police Officers in Critical Driving Situations

Motor vehicle crashes involving police vehicles significantly impact law enforcement officer (LEO) safety, often occurring during high-risk maneuvers like pursuit driving and sudden lane changes. These incidents are exacerbated by LEOs’ interaction with in-vehicle technologies, including Mobile Computer Terminals. Advanced Driver-Assistance Systems (ADAS) could mitigate these risks, though existing ADAS algorithms are not tailored to the unique work demands. To address these challenges, our study develops predictive models for LEO braking and steering in critical situations, based on a driving simulator experiment with police officers. Both braking and steering models were constructed and identified as effective in predicting police officer braking response and steering. The models can be practically applied as part of ADAS systems to deliver warnings at appropriate times, adapting to police officer demands in critical driving situations. Study implications contribute to the wider body of knowledge on surface transportation, occupational safety, and the use of adaptive models.

Cross-leg flap, alternative surgery for post traumatic soft tissue defect of ankle and foot

BackgroundSoft tissue defects that afflict the ankle and foot are mostly the result of trauma. Large wounds with soft tissue defects, especially in the ankle and foot, are a reconstructive challenge due to the lack of availability of local tissues and recipient vessels. Case PresentationWe report a female with a crush injury of the right foot and a Lisfranc injury due to a motor vehicle accident. The patient had a soft tissue defect 20 × 10 cm2 with bone and tendon exposed. The patient had a fasciocutaneous flap from the posteromedial of the distal contralateral leg for soft tissue reconstruction. Both legs were stabilized with a cast. The cross-leg flap was separated from the donor site three weeks later, and K-Wire was removed. Flap evaluation was good, and the patient resumed normal gait and activity without any stiffness of joints related to the flap or cast. DiscussionReconstruction of soft tissue defects in the ankle and foot is a challenge for surgeons due to the paucity of local and regional tissues and associated vessel injuries. Cross-leg flap can be suitable alternative option. In this case, we use medially based fasciocutaneous perforator cross-leg flap, based on the posterior tibial artery perforators. Cross-leg flaps are less technically demanding, and the probability of reexploration is lower than in free flaps. The cross-leg flap has the disadvantage of prolonged immobilization and uncomfortable resting positions. ConclusionCross-leg flap can be alternative solution for covering large soft tissue defects in ankle and foot with its advantages and disadvantages.

Investigation of the Discharge Voltage in Electric Vehicle Motor Bearings

As the automotive industry undergoes a significant transition towards electric vehicles (EV), the matter of electric current discharge in motor bearings has emerged as a focal point of concern. This issue has gathered increased attention due to its potential to inflict damage upon bearing surfaces. The extent of damage inflicted by the discharges is intricately tied to the discharge energy, a factor directly influenced by both bearing capacitance and discharge voltage. In pursuit of a deeper understanding of discharge voltage dynamics within EV motor bearings, electric discharge tests were conducted using in-house modified single ball-on-disc contact and full bearing test equipment. Our test results at the single ball-on-disc contact show that discharge voltage adheres to a probabilistic distribution. Moreover, parallel investigations at the bearing level have yielded corroborative findings, reinforcing conclusions drawn from the single contact tests. These collective efforts contribute to a comprehensive understanding of electric discharge phenomena in motor bearings, essential for developing effective mitigation strategies and advancing the reliability of EV propulsion systems.

Outcome of End to Side Nerve Modified Double Oberlin Procedure and End to End Dorsal Approach Spinal Accessory to Suprascapular Nerve in Partial Postganglionic BPI: A Case Report

Introduction: Brachial plexus injury (BPI) is a devastating peripheral nerve injury that mostly affecting young men, often due to motor vehicle accidents. BPIs can be classified into preganglionic and postganglionic lesions, with postganglionic injuries allowing potential nerve regeneration. The Oberlin method, aimed at reinnervating the biceps, and the Mackinnon technique, targeting both biceps and brachialis muscles, have shown promising outcomes in BPI management. Case report: A 45-year-old man presented with right hand weakness and occasional tingling in the upper arm and fingers two months after a motorcycle accident. Motor examination revealed muscle strength of 0/5 in the right trapezius, rhomboids, serratus anterior (positive winging scapula), pectoralis minor and major, latissimus dorsi, deltoid, biceps, and elbow flexion. Wrist and finger functions remained intact. Diagnosed with post-ganglionic BPI, the patient underwent two nerve transfer surgeries: the Mackinnon technique, transferring the spinal accessory nerve to the suprascapular nerve to reinnervate shoulder muscles, and the Double Oberlin procedure, transferring fascicles from the median and ulnar nerves to the musculocutaneous nerve for reinnervation of the biceps and brachialis muscles. Post-surgery, the patient engaged in an aggressive rehabilitation program focusing on strength, range of motion, and sensory re-education. Over nine months, the patient showed significant improvement in elbow flexion (MRC grade 3), wrist extension (MRC grade 5), hand grip strength (MRC grade 3) with improved sensation across the affected limb. He returned to work and daily activities with mild residual weakness and sensory deficits. Discussion: This case illustrates the effectiveness of the Mackinnon and Double Oberlin nerve transfer techniques in restoring function in a patient with total post-ganglionic BPI. The Mackinnon technique enabled shoulder muscle reinnervation, essential for abduction and stabilization, while the Double Oberlin procedure enhanced elbow flexion by reinnervating both the biceps and brachialis muscles. The combined surgical and intensive rehabilitation approach facilitated significant functional recovery. Conclusion: The successful application of the Double Oberlin and Mackinnon techniques in this case demonstrates their potential in managing total post-ganglionic BPI. Early surgical intervention and consistent rehabilitation are crucial for optimizing recovery outcomes. This case highlights the importance of a multidisciplinary approach in treating complex peripheral nerve injuries. Keywords: Double Oberlin, Mackinnon, Brachial Plexus Injury

Relationship of Mechanism of Injury to Asymptomatic Cervical Spine Fractures in the Elderly.

The Canadian Cervical Spine Rule, a clinical decision-making tool for patients post-trauma is often interpreted as recommending cervical spine computed tomography in patients ≥ 65 years old, who sustain a dangerous mechanism of injury, and/or have extremity paresthesias. We retrospectively reviewed 6 years' of emergency department cervical spine computed tomography reports to determine fracture rates in patients ≥ 65, symptomatic or not, who did and did not have a dangerous mechanism. Of those ≥ 65 years old, 240/13925 (1.72%) patients had cervical spine fractures. The fracture rate in asymptomatic patients ≥ 65 was 0.27%. The fracture rate in asymptomatic patients ≥ 65, who did not have a dangerous mechanism of injury was 0.15%. The rate of unstable fractures requiring surgery was 0.007%. The findings suggest that the algorithm to scan asymptomatic patients ≥ 65, and/or those ≥ 65 without a dangerous injury mechanism, should be revisited for appropriateness and overall value.ABBREVIATIONS: CCR = The Canadian Cervical Spine Rule; CSCT = cervical spine computed tomography; ED = emergency department; EMR = electronic medical record; MVC = motor vehicle collision.

Child Restraint use and Seating Position in Motor Vehicles: An Observational Survey in Ibadan Metropolis, Nigeria

Child Restraint use and Seating Position in Motor Vehicles: An Observational Survey in Ibadan Metropolis, Nigeria

Case Report: Aspirated Airway Foreign Body Mimicking Endobronchial Mass: A Diagnostic Challenge

Abstract Introduction/Objective Despite advancements in imaging modalities, identifying retained foreign bodies within the lung remains arduous. Detecting small foreign bodies is crucial as they can serve as a focal point for subsequent infections. Initial assessments may mimic malignancy. Herein, we present a case of a retained foreign body masquerading as an endobronchial mass, accompanied by unilateral pleural effusion and persistent hypoxia. Subsequent bronchoscopy showed a pearly white endobronchial mass partially obstructing the segmental bronchus at the posterior basal segment of the right lower lobe of lung with accompanying right pleural effusion and atelectasis. Methods/Case Report This is a 58-year-old male with history of hypertension, deep vein thrombosis, transient ischemic attack, and a recent motor vehicle accident with blunt chest trauma. He had a thoracic spinal cord transection with grade III blunt thoracic aortic injury, developed anasarca, hypoxia, right pleural fluid requiring multiple thoracentesis, and right sided hemothorax requiring massive transfusion protocol. Subsequent evaluations, including bronchoscopic transbronchial forceps biopsies and bronchial wash and pleural fluid cytologic examinations showed no malignant cells. Repeat bronchoscopy was concerning for enlarging mass and obstruction. Bronchoscopy almost 2 months after MVA revealed an endobronchial foreign body (tooth) lodged in the left lower lobe of lung posterior segment. Results (if a Case Study enter NA) N/A Conclusion While aspiration of foreign bodies into the tracheobronchial tree is not uncommon especially in children, foreign bodies, particularly teeth, are rare in adults. Bronchial foreign body aspiration may occur in trauma, with diagnosis typically relying on history and physical examination. Detection remains challenging despite imaging advancements, with implications including infection nidus formation. In our case, delayed diagnosis highlights the importance of considering unusual etiologies in persistent pulmonary pathology. Retrospective imaging analysis and CT findings suggested a foreign body, emphasizing the utility of imaging in suspected cases. Prompt surgical intervention is crucial to prevent complications such as recurrent infections.

Evaluation of a distribution, education and awareness intervention for child passenger safety in Lebanon: a low-income and middle-income country setting

BackgroundThe Eastern Mediterranean Region suffers disproportionately from paediatric traffic-related injuries. Despite governmental laws, Lebanon—an eastern Mediterranean country—has low child restraint (CR) use prevalence. This study examined the impact of using...

Crashing into Discovery: Nesidioblastosis in Adult, Unmasked post-Motor Vehicle Accident - A Case Study and Literature Review

Abstract Introduction/Objective Nesidioblastosis, characterized by pancreatic duct-derived B-islet cell proliferation, typically manifests with hypoglycemic symptoms. While more common in newborns, it can rarely affect adults. Here, we report an incidental finding of nesidioblastosis in a 37-year-old female following abdominal trauma due to a motor vehicle crash (MVC). Methods/Case Report A 37-year-old female with no notable medical history presented with blunt abdominal trauma following an MVC. The emergency evaluation revealed a grade 4 traumatic splenic laceration and severe hemoperitoneum. Preoperative lab results showed decreased hemoglobin, elevated white cell count, prolonged prothrombin time, and reduced calcium and magnesium levels. The patient underwent a splenectomy along with a distal pancreatectomy. While grossly unremarkable, microscopic examination revealed maintained acinar architecture with focal hyperplasia around pancreatic ducts. Enlarged acinar cells with pleomorphic nuclei and prominent nucleoli were consistent with focal nesidioblastosis. Results (if a Case Study enter NA) NA Conclusion Multiple studies have documented the first reported case of nesidioblastosis in adults was in 1975. While its exact incidence is uncertain, most sources suggest a relative frequency of 0.5 – 7% of persistent hyperinsulinemic hypoglycemia, with estimated overall an annual rate of around 9 per 100,000, with a higher occurrence among females. This unusual incidental discovery of nesidioblastosis in an asymptomatic patient undergoing pancreatic resection for unrelated reasons highlights the likelihood of underestimating the actual prevalence of this disease.

Forecasting Motor Vehicle Ownership and Energy Demand Considering Electric Vehicle Penetration

Given the increasing environmental concerns and energy consumption, the transformation of the new energy vehicle industry is a key link in the innovation of the energy structure. The shift from traditional fossil fuels to clean energy encompasses various dimensions such as technological innovation, policy support, infrastructure development, and changes in consumer preferences. Predicting the future ownership of electric vehicles (EVs) and then estimating the energy demand for transportation is a pressing issue in the field of new energy. This study starts from dimensions such as cost, technology, environment, and consumer preferences, deeply explores the influencing factors on the ownership of EVs, analyzes the mechanisms of various factors on the development of EVs, establishes a predictive model for the ownership of motor vehicles considering the penetration of electric vehicles based on system dynamics, and then simulates the future annual trends in EV and conventional vehicle (CV) ownership under different scenarios based on the intensity of government funding. Using energy consumption formulas under different power modes, this study quantifies the electrification energy demand for transportation flows as fleet structure changes. The results indicate that under current policy implementation, the domestic ownership of EVs and CVs is projected to grow to 172.437 million and 433.362 million, respectively, by 2035, with the proportion of EV ownership in vehicles and energy consumption per thousand vehicles at 28.46% and 566,781 J·km−1, respectively. By increasing the technical and environmental factors by 40% and extending the preferential policies for purchasing new energy vehicles, domestic EV ownership is expected to increase to 201.276 million by 2035. This study provides data support for the government to formulate promotional policies and can also offer data support for the development of basic charging infrastructure.

Research on Performance of Interior Permanent Magnet Synchronous Motor with Fractional Slot Concentrated Winding for Electric Vehicles Applications

The fractional-slot, concentrated-winding, interior permanent magnet synchronous motor (FSCW IPMSM) has advantages, such as reducing motor copper consumption, improving flux-weakening capability, and motor fault tolerance, and has certain development potential in application fields such as electric vehicles. However, fractional-slot concentrated-winding motors often contain rich harmonic components due to their winding characteristics, leading to increased motor losses and back electromotive force harmonics, thereby affecting the efficiency and constant power speed regulation range of the motor. Based on this, this article first uses the winding function method to explore the inductance and saliency ratio of the interior permanent magnet synchronous motor with different slot pole combinations in the fractional-slot concentrated- winding of electric vehicles. Secondly, this article will establish a 2D finite element parameterized model to analyze and compare the performance of fractional-slot concentrated-winding motors with different slot pole combinations, including air gap magnetic density, back electromotive force distortion rate, overload multiple, and torque. The structural parameters of the motor were optimized with the objective of minimizing the torque ripple under the constraint of minimizing the average torque reduction. The motor slot width, permanent magnet angle, and permanent magnet pole arc angle were analyzed and optimized. The simulation results showed that 12 slots and 8 poles were the optimal design schemes, providing a theoretical basis for the selection of slot pole coordination in the fractional-slot concentrated-winding interior permanent magnet synchronous motor for electric vehicles.

PELATIHAN PERAWATAN KENDARAAN SEPEDA MOTOR BAGI MASYARAKAT DESA SIRNAJAYA

A motorcycle is an engine-driven two-wheeled vehicle composed of different parts that are subjected to different loads during operation, such as heat load, chemical load, impact, bump, twist, push-pull-bend force, friction, pressure. The precision of vehicle components will vary from their original and standard conditions over time such as becoming looser, weaker, or finer. To ensure it is always in top condition, cars require regular maintenance which can be done by a garage or by yourself. In improving the ability to maintain motorcycles and make an income through their own business, especially in the field of motorcycle maintenance services. Through this community service project, counseling on business management and training on motorcycle maintenance skills, including the correct adjustment and use of repair equipment, are provided. The service method applies socialization of motorcycle maintenance theory and direct assistance on how to perform motor vehicle maintenance for Sirnajaya Village youth. The results of this service activity are the increased knowledge, understanding, and abilities of the participants in the field of motorcycle maintenance and repair, besides that this service program supports the success of the community in establishing their own business.

The Driving Profile of Autistic Drivers and Their Driving Experiences: A Systematic Review.

A developmental milestone that both contributes to and facilitates a successful transition into adulthood is the ability to drive. Yet only one in three autistic adolescents successfully obtain a driver's license by age 21 compared to over three-fourths of non-autistic adolescents. Of those who receive their license, there is inconsistency in driving attitudes, experiences and skills. The current study aimed to (1) provide a systematic review of the driving profile of autistic drivers and (2) structurally organize driving performance within a theoretical driving model - Michon's Hierarchical Model of Driving. Following PRISMA guidelines, four databases were systematically searched to identify published articles related to autistic drivers. To be included, all studies met the following inclusion criteria: included autistic sample or people representing or working with autistic individuals, peer-reviewed, published between 2000 and 2021 and contained empirical data reporting on an aspect related to driving or motor vehicle transportation. A systematic search yielded 37 articles that met inclusion criteria. Based on the differential results derived from this review, it appears that autistic drivers are not generally at greater risk of negative driving outcomes; instead, they face unique challenges based on the skills necessary to navigate specific driving contexts. However, due to the inconsistency across results, the actual driving performance in autistic drivers remains unclear. Future research should focus on quantifying these results using an evidenced-based, theoretical framework to identify consistent strengths and challenges in driving performance across autistic drivers.

Severe multiple injuries in a 15-year-old boy with pelvic fracture complete anterior dislocation of the sacroiliac joint and rupture of the internal and external iliac arteries: A case report of a rare injury.

Anterior dislocation of the sacroiliac joint combined with pelvic fractures is relatively rare in clinical practice. It is often associated with hemodynamic instability and severe injuries to other regions, resulting in a complex condition, prolonged treatment duration, and high rates of mortality and disability. However, there are few reports in the literature describing the diagnosis and treatment of anterior dislocation of the sacroiliac joint. In this case, the patient sustained a pelvic fracture with anterior sacroiliac joint dislocation and rupture of both the internal and external iliac arteries following a motor vehicle accident, making it an even rarer and more challenging case to treat. Reporting such cases can enhance the understanding of the diagnosis and treatment of anterior sacroiliac joint dislocation with rupture of the iliac arteries and provide valuable references for similar cases. The patient was riding an electric bicycle and was hit by a small truck, resulting in a pelvic fracture, anterior dislocation of the sacroiliac joint, and rupture of the internal and external iliac arteries. The patient was diagnosed with open pelvic fracture (type C1.2), left complete anterior dislocation of the sacroiliac joint, left acetabular fracture, left internal and external iliac arteriovenous rupture. emergency room resuscitation, intensive care unit resuscitation, 6 surgeries and perioperative management. He has been discharged from the hospital for more than 1 year and was rechecked every month after discharge, the fracture has healed, there is no obvious pain and discomfort in and around the wound, he has been fitted with a prosthesis, and he is doing the walking function exercise. Pelvic fracture with anterior sacroiliac dislocation is clinically rare and critical, and is associated with large vessel rupture, severe organ damage, and high mortality and disability rates. Rapid restoration of pelvic stability and hemodynamic stability is the key to treatment. Rapid transfer to a tertiary trauma center, rapid examination through the green channel to clarify the diagnosis, close intensive care, and reasonable multidisciplinary teamwork for surgical intervention are all valuable experiences that we have concluded.

PENGARUH KUALITAS PELAYANAN PEMBAYARAN E-SAMSAT TERHADAP KEPUASAN WAJIB PAJAK KENDARAAN BERMOTOR (Studi Kasus pada Kantor Samsat Kabupaten Banyuwangi)

Effect Of E-Samsat Payment Service Quality On Motor Vehicle Taxpayer Satisfaction At The Samsat Office, Banyuwangi Regency. The e-Samsat payment service is no stranger to big cities, especially East Java. With e-Samsat services, people no longer need to queue to pay taxes, they can just pay at home without leaving the house. Samsat Banyuwangi is one of the offices that is successful in implementing an online payment system, this is an effort to improve services to taxpayers with fast and convenient service on an ongoing basis. E-Samsat is one proof of increasing motor vehicle tax payment services. The importance of analyzing data in research is to know clearly about the empirical relationship between the two variables studied. The analytical tool used by the researcher is quantitative data analysis, which is a structured report form which is stated with numbers, formulas that can be proven and tested for truth. The data collection method used in this research is using a questionnaire or questionnaire. The results of this study are the influence of service quality (X) on motor vehicle taxpayer satisfaction (Y). based on the results of empirical testing of the hypothesis by using product moment statistics, it produces a number of 0.214 which when compared to the critical price r table product moment for N = 96 with a significance level of 95%, the critical price for N = 95 with a significance level of 95%. The working hypothesis (Hi) is accepted, the null hypothesis (Ho) is rejected.

Impacts of On‐Road Vehicular Emissions on U.S. Air Quality: A Comparison of Two Mobile Emission Models (MOVES and FIVE)

AbstractOn‐road vehicles are significant contributors to air pollution globally, particularly to nitrogen oxides (NOx) and ozone (O3). Quantifying their contribution to air quality is crucial to understanding the trends of vehicle emissions as low‐ and “zero” emission vehicles join the fleet. Modeling on‐road emissions is complex due to various factors like fleet activities, traffic patterns, and meteorological conditions. We compare on‐road emissions from two mobile models: the National Oceanic and Atmospheric Administration Fuel‐based Inventory of Vehicle Emission (FIVE) and the US Environmental Protection Agency Motor Vehicle Emission Simulator (MOVES), finding they contribute 4%–33% to volatile organic compounds (VOCs), NOx, and fine particulate matter (PM2.5) in the contiguous United States (CONUS). Using a regional chemical transport model, we assess air quality effects under different emission scenarios. Both emission data sets yield satisfactory performance, with MOVES showing lower biases in ozone (O3) and PM2.5 over CONUS, while FIVE performs better at city scales due to higher urban NOx emissions. In January, on‐road emissions increased surface O3 over western and southern US by up to 9.1%–13.1% but decreased by 2.5% over the northeastern US, while PM2.5 predictions vary across the US (−85% to 24%). In July, on‐road emissions elevate O3 and PM2.5 concentrations by 15%–20% across CONUS, except in some west coast cities. They also greatly contribute to nitrogen dioxide (NO2) by more than 80% near roads and in urban areas. This study highlights the significant impact of on‐road emissions on urban air quality and provides insights for improving air quality forecasting and management.