There are different truck configuration from one versus another

Gov DOT, Jan 26, 2005

Truck-Pavement Interaction In terms of vehicle-specific characteristics, pavement wear increases with axle
weight, the number of axle loadings, and the spacing within axle groups, such as for tandem- or tridem-axle
groups. Pavement impacts are also influenced by vehicle suspensions, tire pressure, and tire type.

However, the analysis conducted for this study does not quantify these secondary, vehicle-specific characteristics because they are less important to pavement deterioration than pavement type and axle weight.

Further, there is no reason to assume that these characteristics are different,in general, for one truck
configuration versus another.

The gross vehicle weight (GVW) of a vehicle is not the prime determinant of a vehicle’s impact on pavements.Rather,pavements are stressed by loads on individual axles and axle groups directly in contact with the pavement.
Of course, the GVW, along with the number and types of axles and the spacing between axles, determines the axle
loads. Over time, the accumulated strains (the pavement deformation from all the axle loads) deteriorate
the pavement structure,eventually resulting in cracking of both rigid and flexible pavements and
permanent deformation or rutting in flexible pavements.

Eventually, if the pavement is not routinely maintained, the axle loads, in combi-nation with environmental effects,
such as pavement moisture,accelerate cracking and deformation.