Registration fees on passenger and commercial vehicles including heavy duty trucks are the other major source of Michigan transportation revenue. Average passenger vehicle registration fees increased from $24.77 to $48.22, or by 94.9% between 1982 and 1992.10 This increase was primarily due to changing the fee from a weight based to a value based charge beginning in 1983. This change capitalized on the revenue negative trend towards lighter vehicles and the revenue positive trend towards increases in car prices that exceeded the rate of inflation. The registration fees for lighter commercial vehicles increased from $69.24 to $93.79 during the same time period, while the fees for heavy duty trucks increased from $514 to $851. The change in heavy duty truck fees represents a 65.6% increase over 10 years.