If you have an infinite spreading plane of cars moving all in the same direction at the same speed, and if nobody wants to join or leave this infinite plane of

If you have an infinite spreading plane of cars moving all in the same direction at the same speed, and if nobody wants to join or leave this infinite plane of cars, and if none of the cars ever breaks down or runs out of energy, then this works perfectly. Back here on Earth it's not going to solve anything.