Velocity is intrinsic to a particle, and doesn't depend on the observer (i.e. the ground is a preferred observer).

Below is a diagram of a person walking above a street on an overpass. The person is headed north, when they see a car driving as shown on the street below. What is velocity vector of the car relative to the person?

 

 Correct Answer

Students who suffer from this misconception will draw the vector pointing due west (in the direction of the velocity of the car relative to the earth).