PASSENGER CAR EQUIVALENTS OF HEAVY VEHICLES FOR UNCONGESTED MOTORWAY TRAFFIC FROM MACROSCOPIC APPROACH

Different macroscopic approaches of estimating Passenger Car Equivalents (PCE) are evaluated first. Another approach is then introduced in which PCE is estimated by comparing flow rates at same percentage of capacity. Data from Tomei expressway (two lanes in each direction) are divided into various percentage of heavy vehicle class and PCE is estimated for each lane first. Unified PCE for both lanes is then calculated from distributions of total volume and heavy vehicle volume by lane. Results for different geometric conditions and direction of flow are also compared. PCE increases with increase in percentage of heavy vehicle to some maximum and decreases or remains almost constant afterwards.

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