Problem Statement: An engineer is analyzing a 4-lane urban freeway (2 lanes per direction). During the afternoon peak, the total directional volume is measured at 3,000 vehicles per hour. The traffic stream contains 10% trucks.

Given the following parameters:

Calculate the equivalent 15-minute passenger-car flow rate ($v_p$) per lane.

Problem Statement: A highway segment has a traffic stream composed of 12% trucks/buses ($P_T = 0.12$) and 3% recreational vehicles ($P_R = 0.03$). Based on the terrain, the passenger-car equivalent for trucks ($E_T$) is 2.5 and for RVs ($E_R$) is 2.0. Calculate the heavy vehicle adjustment factor ($f_{HV}$).

Problem Statement: A rural freeway has a Base Free-Flow Speed (BFFS) of 75 mph. The lane width is 11 ft, resulting in a lane width adjustment factor ($f_{LW}$) of 1.9 mph. The lateral clearance is 4 ft, yielding a clearance adjustment ($f_{LC}$) of 1.2 mph. There are 4 interchanges over a 6-mile stretch. The adjustment for interchange density ($f_{ID}$) is calculated as $f_{ID} = 3.22 \times (ID)^{0.84}$. Determine the estimated Free-Flow Speed (FFS).

Problem Statement: An analysis of a basic freeway segment yields a 15-minute passenger-car equivalent flow rate ($v_p$) of 1,850 pc/h/ln. The estimated average passenger-car speed ($S$) under these conditions is 65 mph. Calculate the density ($D$) and state what this metric represents.

Given: Density ($D$) is flow divided by speed.