What is the point at which the brakes begin to slow the vehicle?

The point at which the brakes begin to slow the vehicle is called the braking point. Technically speaking the brakes do not actually stop the vehicle, the vehicle is stopped by friction. The brakes stop the wheels and this process begins with the disc brake system. When the brake pad contacts the rotating brake disc it causes the vehicle to slow down due to friction.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it