Answer:
Because it's measure the speed according to the car distance traveled and not the direction of the car movement.
Step-by-step explanation:
The newer cars have digital speedometers; the display would register as a forward speed while backing; and the odometer a positive distance as well. ... In those cars the odometer could run in reverse, subtracting miles.
There actually are simple... The newer cars have digital speedometers; the display would register as a forward speed while backing; and the odometer a positive distance as well. ... In those cars the odometer could run in reverse, subtracting miles