There's a decrease in traffic from car sharing from what you state, moving from a single individual in a car to several in a car, however the overall capacity o

There's a decrease in traffic from car sharing from what you state, moving from a single individual in a car to several in a car, however the overall capacity of the road remains fixed. If car sharing networks become popular in comparison to public transit, then the amount of cars will increase and this will eventually come in conflict with the physical limits of the road network.