And those accessories draw electricity. And what about the more typical traffic jam when rather than literally sitting still for an hour, the traffic crawls at 5 mph?
Even moreso. Like others have noted, if you are absolutely stuck in a gasmobile you can just turn off the engine. But at 5 mph, stop and go, then that is not really a solution. An electric car is at its highest efficiency at low speeds, unlike a gas engine which is at its lowest.