heavy vehicle adjustment factor and the driver population factor. The approaching freeway flow includes 12% trucks and 3% RVs. For level terrain (Chapter 11, Basic Freeway Segments), ET = 1.5 and ER = 1.2. Then The computed values, as noted, are in terms of passenger cars per hour under equivalent ideal conditions. To convert these to service flow rates in vehicles per hour under prevailing conditions, they must be multiplied by the