Make use fees explicitly progressive: pay a fee to use the road, and then at the end of the month, the bottom 25% get back 150% of the average fee, middle 50% g

Make use fees explicitly progressive: pay a fee to use the road, and then at the end of the month, the bottom 25% get back 150% of the average fee, middle 50% get 100%, top 25% get 50% back. Drive less than average and you're making a profit regardless of where you are on the scale.