Abstract
Traffic congestion is a major problem in developing country like Nigeria. Traffic congestion at intersection is on the increase in Auchi metropolis as the numbers of vehicles increases there, which eventually lead to traffic delay and traffic crash casualties. For this research, an Markovian/Markovian/1 (M/M/1) queuing model was used to analyse the queuing characteristic of the intersection to determine the arrival rate and service rate of the vehicles. An operation research software known as Temporary-Ordered Routing Algorithm (TORA) version 2.5 was used to analyze the arrival and service time data obtained to determine the operating characteristics of the M/M/s model for each of the intersection. The result showed that the average traffic intensity of the intersections was more than the optimal traffic intensity of 0.5 indicating the intersections were congested. Signalised & unsignalised Intersection Design and Research Aid (SIDRA) software was further used to analyse the intersection to access the performance measure of the intersection. The result from the SIDRA software also confirmed that the intersection was congested. It was recommended that the capacity of the intersection should be increased; government should construct traffic signals and enforce law to sanction motorists that inappropriately park along the road sides close to intersection; appropriate government agency should carry out more public enlightenment on the use of traffic signal and other roads signs; and alternative roads should be constructed to mitigate the congestion at intersections.
Highlights
Nigeria’s road infrastructure and development has lagged behind, prominently in most part of the country and most noticeable in rural areas
It was recommended that the capacity of the intersection should be increased; government should construct traffic signals and enforce law to sanction motorists that inappropriately park along the road sides close to intersection; appropriate government agency should carry out more public enlightenment on the use of traffic signal and other roads signs; and alternative roads should be constructed to mitigate the congestion at intersections
Three-way intersection is a junction between three road segments, T-junction and Y-junction occur when two arms form one road, four-way intersection usually involves a crossing over of two streets or roads, five-way intersection exits especially in urban areas with non-rectangular blocks and six-way intersection usually involves a crossing of three streets at one junction
Summary
Nigeria’s road infrastructure and development has lagged behind, prominently in most part of the country and most noticeable in rural areas. As the road intersections serve as the throat for the urban/rural traffic, their capacity is much lower than the total sum capacity of all road sections entrance for the intersection. The main reason for traffic congestion and bottleneck is shortage in intersection’s capacity, rather than the road capacity. Intersections may be classified by number of road segments and traffic control. According to [1], intersections are classified according to the number of road segments (arms) involved as three-way, T-junction, Y-junction, four-way, five-way and six-way intersections. Three-way intersection is a junction between three road segments (arms), T-junction and Y-junction occur when two arms form one road, four-way intersection usually involves a crossing over of two streets or roads, five-way intersection exits especially in urban areas with non-rectangular blocks and six-way intersection usually involves a crossing of three streets at one junction. For a signalized intersection to be successful, intersections have to be designed in form of islands
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