Coordinated Control Between Expressway Ramp and Exclusive Bus Lane Based on a Breakdown Probability Model

Traffic delay is often considered as an important indicator for evaluating coordination control schemes of expressways.However,due to Breakdown phenomenon,sudden changes of vehicle speed can happen,which lead to great uncertainties in great uncertainties based on the delay.Therefore,in order to solve this problem,Breakdown probability is introduced as an evaluation indicator,and it is combined with the delay indicator to form a comprehensive evaluation indicator.In this paper,four control schemes are designed based on ramp control and bus lane settings.Based on the improved Breakdown probability model and INTEGRATION simulation software,the proposed four control schemes are evaluated using,Breakdown probability indicator,delay indicator,and the comprehensive evaluation indicator.The results show that the indicator of Breakdown probability is inconsistent with evaluation results of delay indicator,which means this indicator is reasonable to evaluate the coordination schemes during formation processes of congestions.However,the indicator of Breakdown probability is consistent with the results of comprehensive indicators.In addition,the indicator of Breakdown probability can be used to quantitatively evaluate impacts of coordination methods of Breakdown probability.The ramp metering can reduce the Breakdown probability by 7 % while the installation of exclusive bus lanes increases the probability by 12 %.The comprehensive evaluation indicator can balance the differences between the results of Breakdown probability indicator and traffic delay indicator,which can get a comprehensive evaluation of control schemes.