Supply a license plate number/state, and Zap'll let you gripe your heart out about anyone on the road; current complaints range from the obvious "made a u-turn into oncoming traffic", to the less obvious "eating noodles at the stop light, fork and all", to "swerving all over the road and riding people", which explains the swerving.

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Vent your vehicular vengeance at Zapatag.com