Actually he's not relaxing/flexing, it'S because he's getting to the threshold where the animation would normally go hand over hand. It's a bit weird how they did it in this game and I agree that it doesn't really make much sense for that particular car but yeah... it's "normal".
Ah, well that sort of makes sense. They should drop that part of the animation out for that car type then .
I'd make a similar motion after a long driving session on straights. My hands always started cramping up, bleh. I only did it fur fun though. One of my closest friends raced for years, and I use to take my Corvette to the tracks.
For those that mentioned "god rays", after watching a few videos, it is definitely too exaggerated. I'd probably tweak it too on PC/Console if it's there.