The analogy requires that the passing vehicle is moving at a relative speed such that debris striking front are back are at the same speed. Any deviation in the velocity of the vehicle being struck would result in the relative speeds of impact of the debris being different. Therefore the hypothesis would only hold for those specific velocities of the impacted vehicle relative to the debris. As suggested, even a broken clock can tell the correct time twice a day (or once if it's 24-hour clock).Assuming that what Michelson was really measured was a a cycloid motion, and the "The universal cycloid motion through time" thread proposes that, and the measurements are at the contact point, ( it was a time comparison after all) then all measurements are the same.
If you live in the northern latitudes you will have ample proof: some fresh wheel tracks in the snow show that the tires seem to have been standing still, no matter the speed or direction of the vehicles movements . so:
does electro magnetism work as a cycloid ?
For example, looking at the analogy, if the passing car was travelling 10mph quicker, the debris striking the front would impact 10mph faster, the debris striking the back 10mph slower. Different relative speeds. Therefore either your analogy is broken for all other relative velocities than the specific one that works, in which case you need to provide actual detail as to what you are proposing - preferably with examples - or your theory is broken.