[dannyw]

For context, a loaded truck does more than 10,000x the amount of damage as a normal car. The damage is the 4th power of the axel.

If tolls and road usage taxes were fair and proportionate, you should be paying a $0.01 toll while trucks should be paying $100.

Source: AASHO Road Test

[wtvanhest]

Road damage is part of the equation (repair costs), the other part is congestion (capital costs for additional capacity).