2.7.1 Make-up of the fleet of trucks with 5 or more axles
The make-up of the truck fleet (TIUS Column D) with 5 or more axles for the five western border States and surrounding States is shown in Table 2-7-1. It also shows the truck fleet with four or less axles. For the five border States, there are significant differences in the percentages of the total truck fleets in western border States having five or more axles. Combination trucks having five or more axles account for 1 of 10 of the registered truck fleet in North Dakota, 1 of 5 in Washington, Idaho and Minnesota, and 1 of 4 in Montana. More specifically:
Tractor-semitrailer combinations are most common--7 of 10 in Washington and Idaho, 8 of 10 in Montana, and 9 of 10 in North Dakota and Minnesota (86.6 percent nationwide).
Truck-trailer combinations are the next most common--1 of 5 in Washington and Idaho; and 1 of 10 in Montana, North Dakota and Minnesota (7.5 percent nationwide).
Tractor-double trailer combinations follow--1.5 of 10 in Washington and Idaho, 1 of 10 in Montana, 1 of 20 in North Dakota, 1 of 100 in Minnesota (5.9 percent nationwide).
Tractor-triple trailer combinations are either non-existent (Washington and Minnesota) or infrequent (less than 0.1 percent nationwide).
Ninety percent of the truck fleet in North Dakota is made up of single unit trucks or combination units with four or less axles; 80 percent in Washington, Idaho and Minnesota; 75 percent in Montana. These compare to the nationwide figure of 80.6 percent.
2.7.2 Commodity Handlings
Table 2-7-2 lists the commodity handlings of (TIUS Column D) trucks in the western border States. Trucks identified in TIUS as personal transport, no load carried, not in use, other and craftsman's equipment are removed to establish the total of trucks of interest to this analysis. For the five border States combined:
One-third of the 287,100 trucks of interest are used for transporting farm products.
An additional one-third are used for transporting building materials (1 of every 8 trucks), processed foods (1 of every 12), live animals (1 of 17), lumber and fabricated wood products (1 of 25), and transportation equipment (1 of 28).
Each of the other named commodities (machinery, animal feed, petroleum, refuse, mixed, chemical, logs) is handled by roughly 1 of every 30 trucks.