Because a dog was chasing him across it. Because 你 scared him. Because he was depressed and wanted to be hit 由 a car. Because he saw another Chicken on the other side. Because he was running from the cops. Because Target was on the other side. Because he was running from justin bieber. Because 狼 were after him. Because a hunter was after him. Because the Cullens were after it. Because he just felt like crossing the road!!!!
But why did the chicken want to get to the other side? He wanted to 交叉, 十字架 the road. It makes sense, because sometimes, a chicken has to 交叉, 十字架 the road.
In a seriousness, the chicken wanted to 交叉, 十字架 the road to sue KFC for killing its family.