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Aiming at the issues of global warming and climate change, this research proposed three kinds of models to evaluate the effect of idling stops, expressed as the idling stop time, on red light at signalized intersection under random arrival of vehicles. The first one evaluates the maximum idling stop time, whereas the second one focuses on the idling stop time conditioned by an acceptable remaining red time. The third one is then used to estimate the increment of the idling stop time as the driver’s willingness for idling stop is raised, i.e. the acceptable remaining red time drops. The results of a case study show that the idling stops will really help to improve the energy saving and carbon reduction due to the occurrence of a large amount of idling stop time. The maximum IST can reach 42,938 hrs during the off-peak period on holidays in a year. Although the increment of the idling stop time seems insignificant by the case, it would become remarkable and significant when the evaluation base is extended to all approaches, and all intersections.

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