Rural Interstate Travel by Vehicle Type (Distribiton of Average Daily Traffic Volumes and Equivalent Axle Loads 1/ on the rural Interstate system as a Percent of Total)
Percent of Average Daily Traffic
Autos, Buses and Light Trucks 2/ : 76
Heavy Single Unit Trucks 3/ : 4
3 & 4 Axle Combination Trucks: 1
5 + Combination Trucks: 18
Equivalent Single Axle Loads
Autos, Buses and Light Trucks 2/ : 1
Heavy Single Unit Trucks 3/ : 7
3 & 4 Axle Combination Trucks: 3
5 + Combination Trucks: 89
1/ Equivalent axle loads provide a means of measuring vehicle wear on pavement by relating them to an 80 kilonewton (18,000 pound) single axle load.
2/ All 2-axle, 4-tire trucks. Includes pickup trucks, vans and other vehicles (such as campers, motor homes, etc.).
3/ All vehicles on a single frame having either 2 axles and 6 tires of 3 or more axles (including camping and recreational vehicles and motor homes
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