Environmental Engineering Reference
In-Depth Information
5-axle Tractor-semitrailer
Standard
productivity
vehicles
Double
6-axle Tractor-semitrailer
Rocky mountain double
Higher
productivity
vehicles
Triple trailer combination
Turnpike double
Figure 13.5 Conventional 5-axle truck configurations and long combination vehicle configurations in
North America.
Adapted with permission from Tunnell, 2008.
Long combination vehicles
The use of long combination vehicles instead of conventional configurations results in a sig-
nificant reduction of fuel consumption per tonne of product transported. To illustrate the con-
cept, an example of a study in the United States will be presented; other countries have
different configurations and regulations about higher productivity vehicles, such as the road
train in Australia.
Figure 13.5 shows typical configurations for conventional and long combination vehicles
found normally in North America. Conventional configurations are legal to circulate in most
places while long combination configurations are more restricted and require special permits
 
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