I’m animating a car image down a curvy highway to match an aerial shot of a highway. Having trouble getting the car to go the same speed through all keyframes. Started with beginning point/ending point keys, then set various continuous Bezier keypoints  to allow making the motion path follow the curves in the road. Obviously that changes distance between keys and changes speed of object animating along that motion path. Is there a trick or way to select all keys and have motion/speed by affected only first and last keys? IOW constant speed from begin to end?

Thanks,

John