30
TOLL ROADS AND FREE ROADS
average daily vehicle-mileage, in the other half it is made in terms of average daily traffic volume.
Plate 18.—Map showing location of most important 6,069 miles of selected system as indicated by estimates of traffic based on operation as a toll facility.
Plate 19.—Map showing location of most important 7,931 miles of selected system as indicated by estimates of traffic based on operation as a toll facility.
It will be noted that the total vehicle-mileage estimated for the toll facility on all routes is about one-seventh of the vehicle-mileage
