【摘 要】
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Travel time reliability as a new concept has been incorporated into the 2010 version of the HCM,which can effectively evaluate the dynamic characteristics of the traffic system.This paper introduces t
【机 构】
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Beijing Police College
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Travel time reliability as a new concept has been incorporated into the 2010 version of the HCM,which can effectively evaluate the dynamic characteristics of the traffic system.This paper introduces the travel time reliability measures and calculation method.using the real data of south fourth ring road in Beijing,the variation of the travel time is analyzed on spatial and temporal dimensions.Then the reliability indices Planning time index and Travel time index are calculated,and the highest PTI and TTI are 2.39 and 1.70,respectively,all in PM peak period.Finally,based on computing the travel time reliability without bad weather,it was found that bad weather makes PTI maximum drop of 0.32 and TTI drop of 0.18.
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