Integrated control model of urban expressway off-ramp and correlative intersection

In order to keep the queues of intersection and off-ramp from backupping to expressway mainline, an integrated control model of off-ramp and correlative intersection was proposed based on cell transmission model(CTM). When overfull queue appeared at off-ramp, red truncation strategy or green extension strategy was adopted. When overfull queue did not appear at off-ramp, the cycle and green signal ratio of intersection were optimized dynamically to minimize the average vehicle delays of off-ramp and correlative intersection. Simulation result shows that the vehicle average delay of correlative intersection increases by 1.74 s, but the queue decreases from over 200 m to 160 m, so the strategies and model are reasonable and effective. 5 tabs, 7 figs, 14 refs.