He is trying to startle people out of their cage-induced altered emotional state by asserting his right to the road. I think we desperately need more of this kind of activism in the USA. Moreover, the way he flashes the "red card" is a hilarious and uniquely effective way to communicate infraction violations in the UK. Unfortunately, a red card would be lost on most USAnians. I occasionally hand out cards with traffic laws to miscreants but I wish I could think of something better.