Analysis of total passager delay at signal coordinated intersection based on green extension strategy

The delay at signalized intersection is one of the important evaluation indexes of the control effectiveness. Formula of triangle area is applied to calculate the delay at signalized intersection in the existing theories. However, the vehicles arrive the signalized intersection in platoons under the condition of signal coordination for arterials, it is inaccurate to use triangle area to analyse the delay. In this paper, based on green extension strategy, formula of parallelogram area was applied to calculate the vehicle delay. And then,considering the impact of green extension strategy on both prioritized buses and general traffic, a formula of reduced total passager delay was put forward by derivation of equation. At last, a simulation study was conducted for comparison analyses, and the simulated result showed that the approach of using parallelogram area to analyse the delay is feasible. It would be significative for the further study of BSP control strategy.