Millhouse was riding his bike on a city street. While he was riding, he frequently looked back to verify that the books that he had fastened to the rear part of his bike were still attached. On one occasion while he was looking behind his back, he failed to notice a car that was entering an intersection just as he was crossing it. The car hit him, causing him many injuries. Three eyewitnesses stated that the driver of the car failed to stop at the stop sign before entering the intersection. Millhouse sued the driver of the car for negligence. What defenses might the defendant driver raise in this lawsuit? Discuss fully.