Optimisation of variable speed limits at the freeway lane drop bottleneck

The primary objectives of this study were to use variable speed limits (VSL) upstream freeway lane drop maintain capacity and reduce congestion. As driving behaviours are the main reasons leading microscopic simulation can reflect precisely, simulations first used test scenarios. objective function constraints determined according traffic engineering practice optimised using a modified genetic algorithm (GA) based on get optimal limit combination. GA guarantee solution diversity results. Then, cell transmission model, macroscopic flow was crosscheck simulated Both analysis results demonstrated that VSL could only improve efficiency if set appropriately. This provided new process from aspects for analysing problems.