Passenger Car Equivalents For Basic Freeway Segments On Addis Ababa Adama Expressway

In freeway traffic flow contains different types of vehicles, due to the variation of vehicles in therntraffic flow the speed of passenger cars influenced by heavy vehicles, for the reason that heavyrnvehicles uses more driving area of the road and limited performance. Hence according to localrnconditions developing Passenger Car Equivalents (PCE) for trucks and buses on upgrade and downrngrade is an essential parameter. So the major objective of this research is to evaluate Passenger CarrnEquivalents (PCE) for trucks and buses for basic freeway segments on Addis Ababa – AdamarnExpressway and compared with that of Highway Capacity Manual 2010 provided.rnThe data was collected from the field by using videotaping on Addis Ababa – Adama expressway inrnthe selected sites on the basic freeway segments at every collection site for the percent grade withrnthe corresponding grade length. And the development of Passenger Car Equivalent was carried outrnby transcribing the recorded video in to tabular form with proportion of trucks and buses, base flowrnrate and mixed flow rate and also analyzed by using Equal Flow Density method.rnIn this study the proportion of trucks and buses considered from 10% up to 50%, the Passenger CarrnEquivalent increases as the proportion of trucks and buses decreases. The major variation observedrnin lower trucks and buses proportion non-linearly because the interaction between trucks and busesrnwith passenger cars increases. Moreover for trucks and buses proportions from 10 % up to 50 %,rnthe value of PCE varies in between 1.4 up to 7.8 for upgrade up to 5 % which is higher than thernHCM 2010 recommended value that varies between 1.5 up to 3.0. For trucks and buses proportionsrnof 10 %, the value of PCE varies with the length of grade in between 5.6 up to 7.8 for 5 % upgradernwhich is higher than the HCM 2010 recommended value that varies between 1.5 up to 3.0.rnThe study concludes that while analyzing by using the executed Passenger Car Equivalents shows arnbetter assumption than Passenger Car Equivalents on HCM 2010. So the executed Passenger carrnEquivalents for the basic freeway segment on Addis Ababa – Adama Expressway provides arnrealistic result while analyzing the traffic flow.

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