Abstract:

The queue dissipate velocity was estimated by shockwaves theory and the maximum queue was deduced by the cumulative method. Between start time of a cycle to the maximum queue time of the downstream intersection,  the threshold of offset model was derived when a spillover was happening by  the basic physical principle that arrival vehicles add initial vehicles equal vehicles dissipated from the downstream. Traffic flow of a link and link queue with a same traffic flow were changed,  and the offset thresholds were calculated respectively. Results showed the model could  avoid traffic spillovers effectively.

Key words: traffic spillover, offset threshold, traffic control, intelligent transportation system, traffic congestion