Both the Roadster and the Model S also take advantage of what’s known as regenerative braking, which extends the life of the brakes. During stop-and-go situations, the Tesla will brake by kicking the motor into reverse via software and slowing down the wheels instead of using brake pads and friction to clamp them down. The Tesla motor generates electricity during this process and funnels it back to the batteries, which is why electric cars get better mileage in city traffic.
-Ashlee Vance
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