Newton's three laws and their relation to car safety

In terms of Newton's three laws of motion, how do the following safety features work?
- Cruise control
- Pre-crash systems using radar and laser sensors
They warn the driver, precharge the brakes, inflate seats for extra support, move the passenger seat, position head rests to avoid whip lash, tension seat belts and automatically apply partial or full braking to minimize impact.
- Lane-depature warning and blind-spot warning

For cruise control:

Friction in the drive train and air resistance act in opposition to the motion of the car, so they slow it down. If your car had a frictionless drive train and bearings, and it was in a vacuum traveling in a straight line at a constant velocity - it would just keep on moving at that constant velocity. But in real life friction and air resistance are acting in opposition to its motion - so these forces are unbalanced forces which act to slow your car down. So, in order to keep your car moving at a constant velocity, the engine must be used to "counteract" these unbalanced forces.

So your cruise control opens the throttle, to counteract the forces of friction in the drive train and air resistance (and gravity, if you're traveling up an incline).