Abstract
Evaluating the performance of a multi-lane intersection is important to identify the best scheme as congestion is becoming a worldwide serious problem. A Multi-stream Minimum Acceptable Space (MMAS) Cellular Automata (CA) model is used for the simulation of vehicular traffic at double-lane roundabouts and cross intersection. Comparison is made between roundabouts with traffic light and without traffic light and signalized intersections on the basis of their performance to simplify traffic congestion. Computer simulations are used to propose critical arrival rates to separate between the three mentioned modes to decrease congestion at intersection points.
Highlights
Nowadays traffic congestion is one of the main societal and economical problems in urban areas related to transportation industries both in developed and developing countries
When the arrival rate at the intersection is above 0.64 vps per lane the roundabout must be removed and substituted with cross intersection controlled with traffic light, as this will result in more than 5,000 vehicles difference in throughput within an hour, which will otherwise form a queue
5 CONCLUSION Though modeling multi-lane roundabout is a complex activity due to drivers’ behavior and vehicle-to-vehicle interaction, Cellular Automata model can successfully catch these parameters in a better detail
Summary
Nowadays traffic congestion is one of the main societal and economical problems in urban areas related to transportation industries both in developed and developing countries. Modern traffic management depends highly on the efficiency of mechanisms, such as the controlled intersection and multi-lane roundabouts to maximize flow along the system. The performance of single and double lane unsignalized, signalized and roundabout intersections have been investigated in Kakooza et al (2005) in terms of expected number of vehicle and waiting time using simple mathematical modeling. All entering vehicles on the approaches have to evaluate a gap in the circulating flow before entering the circulating traffic With these entire features, a roundabout has some advantages in comparison to signalized intersection such as yield-at-entry operation, fewer conflict points, allowing more time for drivers to react while reducing crash severity, and vehicles travel in the same direction virtually eliminating the possibility of right angle or head-on collision. Each road section can either be occupied by a vehicle or is empty and the dynamics are given by update rule as discussed below
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