--That would require a very large fly-wheel. Where does the energy come from to spin it? Going down hill?
Do these cars have one?
Sorry for what might be a dumb question but I am no more versed on this technology than I am on voodoo.--
The motors act like generators when braking. The energy recovered during braking is used to charge the batteries. This technology is being used in today's hybrids.
Wouldn't that basically require a "coasting" stop?
City driving would require conventional brakes that could add nothing but dust and heat.