As fuel consumption is an important topic for the truck customer, competition between the various vehicle manufacturers ensures that new, more efficient vehicles are constantly being offered. Both the drivetrain and the vehicle are being continually optimized to reduce fuel consumption.
In the USA the overall length of the vehicle is not limited as it is in Europe. U.S. vehicle configurations are intensely characterized by the “bridge formula”, which envisages minimum spacings between axles to conserve bridges [45].
There have been inverted systems for several decades in the public transport system: there, an approaching regular bus signals that it requires a green traffic light.
