As I recall, it's only DOT required for GVWR of under 10,000 pounds. The heaviest GVWR Transit 350 does not have an actual brake light up there -- just a tail light. Which is stupid, for what little extra wire would cost; I'd think it would be cheaper to wire them all the same, in this particular regard.I've been behind a couple different Promaster's lately and noticed they didn't have a high mount, third brake light. I think all three roof height versions of the Transit have it and thought it was a DOT thing. What gives?