A study reported in The Observer measures the erotic quotient of different parts of the body. The bit that relates to relationships on the road is this from Prof Oliver Turnbull of Bangor Uni, who led the study: “… we all share the same erogenous zones, whether we are a white, middle-class woman or a gay man in a village in Africa. It suggests it is hardwired, built in, not based on cultural or life experience”. In the same way, our instinct to take it in turns based on time of arrival transcends nationhood and culture. Our problems on the road are almost exclusively down to the anti-social rule of priority, which subverts our cooperative instinct, and makes us act against our better nature. The result? Avoidable death, damage and injustice on our mismanaged roads.