The helicopter and car are most likely travelling in the same direction at the same speed. It can be govern by relative motion.
What is speed?
Speed is the rate of change of position of an object in any direction. Speed is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only magnitude and no direction .
What is relative motion?
Relative motion is the calculation of the motion of an object with regard to some other moving or stationary object. Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
Assume, you are jogging side by side with a person. Between you and other person, there is no relative motion. If you pass by someone who is standing stationary, you will have relative motion with respect to that individual, but not compared to the person jogging with you.
Thus, assume the car is also travelling westward. In that case, it depends where the observer is. If the observer is in the car, the helicopter would look like it is standing still because both objects have the same velocity. If the observer is on the side of the road, both objects would be travelling at the same velocity.
To learn more about Relative motion here
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