Simulation Test under Scenario. 1 In Scenario 1, transit vehicles operated under the 120-second-cycle signal plan, and 15-second early green and green extension times were used for TSP control strategies. To facilitate results analysis, several secondary XXXx, including the average person delay, intersection delays, and intersection stops, were collected for both transit and general traffic. Table 10-1 shows the average delays and stops for both southbound and northbound transit vehicles along the corridor. Comparisons between two systems, one with TSP active and the other without TSP, are illustrated in the table. The same random seeds were used for corresponding iterations of the two systems. Note that the delay time for transit vehicles did not include dwell times at transit stops. However, the acceleration and deceleration delays at a stop remained part of the delay time. From this table, we can see that significant improvements were achieved in terms of the average transit vehicle delays and numbers of transit stops at an intersection. The average transit delay decreased by 15 seconds, and the number of transit stops decreased from 3.74 to
Simulation Test under Scenario. 3 The 150-second-cycle signal timing plan was also evaluated, and simulation tests were conducted for Scenario 3. Tables 10-7 and 10-8 show simulation results for both transit and local vehicles. From these two tables, we can see that the TSP system functioned reasonably well under this control strategy. The transit delay time decreased from 452.2 seconds to 434.1 seconds for both the northbound and southbound directions along the corridor when the TSP system was on. The number of stops also decreased from 2.61 to 2.45, and a t-test verified that these improvements were significant at the p=0.05 level. Further studies were conducted to analyze local traffic operations based on Table 10-8. There were no significant negative impacts from the TSP system on local traffic. Table 10-7 Simulation Results of Delays and Stops for Transit Vehicles along the Corridor for Test Scenario 3 from Ten Simulation Iterations Test Period 3 Hours AVD1 ANS2 Simulation Iterations TSP On TSP Off TSP On TSP Off 2 431.8 443.8 2.59 2.45 3 433.5 463.0 2.23 2.77 4 423.8 460.3 2.23 2.68 5 440.9 470.9 2.36 3.00 6 431.8 446.7 2.27 2.36 7 431.7 443.9 2.59 2.55 8 434.2 448.3 2.45 2.59 9 441.9 451.5 2.55 2.55 10 438.2 433.5 2.50 2.23 Average 434.1 452.5 2.45 2.61 Significance Test at the p=0.05 level Y Y 1 Denotes average vehicle delay; 2 denotes average number of stops In short, under the 150-second-cycle signal plan, significant improvements were observed for transit vehicles traveling along the corridor because of the TSP system in terms of average delays and stops. Meanwhile, there were no significant negative impacts on local traffic resulting from the TSP system under this test scenario.
