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1. In 'L' mode which is used for one-pedal driving, is the car capable of driving at freeway speeds? I ask because ICE cars from the past would shift no higher than 1st or 2nd gear in their respective 'L' mode. Would I be overreving the motor or causing premature wear by using 'L' mode for driving the car in this mode?

2. Does the regen paddle on the steering wheel use another set of brakes separate from the disc calipers to slow the car as it uses the momentum to recharge?

3. Does the regen paddle trigger the brake lights as it slows the car (like an ordinary brake pedal would)?
 

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2017 Bolt EV / 2014 Spark EV / 2020 Tesla Model Y
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Where ICE cars are shifting gears - and hence motor speed - electric cars don't do that. In fact, electric motors are so strong and flexible, they don't need (or have) traditional transmissions to manage limited speed capabilities and power bands.

Regenerative braking comes from letting the kinetic energy of the car spin the motor. Basically the wheels are spinning the motor instead of the other way around.

'L' mode is changing the the strength of the motor by adjusting its magnetic field so that it can be a stronger generator. The motor is still spinning the same speed as it was the moment before switching from 'D; or pressing the paddle.

If the field strength of the motor were very low, there'd be hardly any drag on the car at all... that's 'D'. But as you lift your foot while in 'L', the car steadily increases field strength in the motor. The stronger field causes the motor to work harder as a generator, harder to turn, which more quickly drags down the speed of the car.

The regen paddle is just more of the same - doubling down again on the field strength so that the motor is acting as an even stronger generator.

There's just the one set of traditional disc brakes in the Bolt. They are not involved with either 'L' or the regen paddle.

Yes, brake lights do come on when the Bolt EV is using regenerative braking. This is not true of some other models, like the Volt, which doesn't have as intense braking effect when in 'L'...
 
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3. Does the regen paddle trigger the brake lights as it slows the car (like an ordinary brake pedal would)?
Yes, brake lights do come on when the Bolt EV is using regenerative braking. This is not true of some other models, like the Volt, which doesn't have as intense braking effect when in 'L'...
Pretty much what gaulfinger wrote. I do have one more thing to add: the brake lights will turn OFF once you decelerate below a set amount of "Gs". Essentially, when you stop using either L or the paddle, the brake lights that were on will be off even though you're stopped. You can test this in a parking lot or quiet neighborhood street at night by observing the red brake lights reflecting off your rear window wiper. As you slow in L, the lights come on then when you finally coast to a stop, the lights turn off.
 
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