In orcler to study the influence of speed limit value,closed lane number,and working area length on the traffic organization mode of a two-way,eight-lane expressway under different traffic volumes.The traffic simulation model to simulate four typical sec-tions of different annual average daily traffic volumes of expressways.The speed limit value is 60 km/h and 80 km/h,the closed lane numbers are 1 and 2,respectively,and the working area length is 1～4 km.Fifty-six working conditions of different variable combina-tions are calculated to obtain the average travel time index and the maximum queue length index.The results show that the average travel time and working area length of section 1 and section 2 increase linearly.The average travel time of 60 km/h is greater than 80 km/h,and the maximum queue length is 0.Section 3 is similar to section 1 and section 2 when close to one lane.When closing two lanes,the average travel time is about 2 to 4 times that when closing one,resulting in congestion.For section 4,the average travel time is about 6～12 times that of the unobstructed section,and the maximum queue length is more than 7 km.Therefore,the traffic organi-zation mode with a speed limit of 80 km/h,close two lanes,and a working area length of 4 km is selected for section 1 and section 2.It suggests that the traffic organization mode with a speed limit of 80 km/h,closing one lane,and a working area length of 4 km should be selected in section 3.It is not recommended for all-day closed construction in section 4.If section 4 has urgent construction needs,the closure time or night construction can be reasonably determined according to the maximum queue length the actual traffic operation can withstand.
维普
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