A chicken in Shediac, New Brunswick (Canada) crosses a busy road everyday. She waits for a break in traffic before crossing, regardless of how long the wait is, then looks for food in the grass of a local doughnut shop. A regular customer at the doughnut shop said the chicken visits up to three times a day.
So the answer to "Why did the chicken cross the road?" is, apparently, to get to the doughnut shop!