> This is true, but some portion of road maintenance costs is independent from vehicle-caused wear-and-tear on the actual road surface. Possible formula to acc

> This is true, but some portion of road maintenance costs is independent from vehicle-caused wear-and-tear on the actual road surface. Possible formula to account for all the variables: annual tax = F * (A + [BC{D^E} ] ) A = constant for non-loading based degradation (frost heave, slope maintenance). Base tax B = constant to scale the following terms C = distance driven in km D = axial weight E = exponent to account for non-linear relationship of axial weight to road degradation F = adjustment for usage (could adjust for anything - user type, income class, vehicle class, etc etc)