[ajuc]

> Let's say a ride is $10 if you drive in a car alone. $5 if you share with another person and $3 if you share it with 2+ people.

This is overly complicated, hard to implement and to prevent abuse. There's a much simpler way already in place - tax on fuel. And it's much harder to circumvent or abuse. You can hope they won't catch you driving alone and paying as if you drove with 3 people in car. You can't hope to drive without fuel.

Increase the fuel prices 10 times and people will be much more efficient with their use of transportation. You use almost the same amount of fuel no matter if you move 4 people or 1. And public transport uses slightly more to move 20 or 50 people. With high enough fuel prices we can reduce traffic jams to 0.

The problem is - it will suck and people will complain. Ultimately people spend time in traffic jams because that's what their least sucky option is.