External regenerative braking

I have read a number of regenerative braking ideas on here but they always seem to involve storing the energy within the vehicle for later re-use.

Braking often happens at predictable locations e.g. motorway exit slip roads. I propose that the road surface at such a location is constructed of lateral rollers, which are mechanically linked (perhaps by rotating shafts running beneath the motorway) to the entry sliproad on the opposite carridgeway.

Drivers leaving the motorway would brake hard to lock the wheels of their car, so all of the car's velocity is transferred to the rollers, and so across to the accelleration rollers which are speeding up the cars entering the motorway opposite.

There will be significant friction losses in the system, so the accellerating cars will have their gears engaged, but will need far less fuel to accellerate to motorway cruising speed.

Safety: there will need to be small disk brakes on each roller, acutated from within the car in an emergency, perhaps by blurtooth, or by reaching out of the car window to tug a penguin cord. Or perhaps a person can sit in a little cabin monitoring the system, ready to apply the roller brakes in the event of a pile up or other dangerous situation.

This system could be implemented wherever there is a stream of traffic braking, and another stream accelerating away.