There have been concerted efforts from researchers to find efficient techniques for solving traffic congestion problems at road junctions over the years. Traffic congestion results in excess delays, fuel wastages, reduced safety, wear and tear on vehicles. This paper focuses on solving the problem of traffic congestion at isolated Cross and T-type intersections using simulated annealing approach. The existing simulated annealing model was formulated by adding a parameter (mLan) to the initial signal timing plan (iLan) to give the next guess signal timing plan. The formulated model was simulated on a MATLAB environment for twenty cycles with each cycle having two phases at Cross and T-type intersections under consideration. There were three (L1, L2 and L3) and four (L1, L2, L3 and L4) vehicle streams in the T-type and cross intersections, respectively. In the Cross type intersection, the results of the simulation revealed that L4 was the busiest and L3 was the least busy streams with the frequencies of 15 and 3 vehicles, respectively. Similarly, in the T-type intersection, L2 was the busiest and L3 was the least busy streams with the frequencies of 28 and 8 vehicles, respectively. The solution provided in this paper could be useful in studying and improving traffic flow at isolated Cross and T-type intersections.

Traffic congestion simulated annealing vehicle stream intersection cycle.