Meh. If I need the data while driving, it should be up on the dash or a heads up display. If its for after the track, then it should connect to my smart phone and put it there. Don't see what value add a watch brings to the table.
Dumb, you don't want people staring at their wrist while driving......
If its important data it should be projected onto the window. If its not important, then the data should only be accessible once the car is turned off, ie via a smart phone, or computer.