Allow cars with 4 or more people in the bus lanes

We should introduce the rule that if you have 4 or more people in the car, then you are allowed to drive in the bus lanes. Driving with four people in the car vs one means the use of fossil fuels per person is significantly less. These people should be rewarded by being able to skip high levels traffic.

This will hopefully create an incentive for car-sharing and increase the number of people doing it. In theory, the number of cars on the road will decrease which will be better for reducing traffic, air pollution and fossil fuel consumption.