There are two specific occasions when a motorist is allowed to stop in the box, however they are intended to be exceptions as opposed to the norm. If a motorised vehicle has crossed the first white line on a green light, i.e. entered the box, and the traffic lights then turn red, they must stop before they cross the second white line i.e. before they leave the box. If the vehicle is so close to the first stop line when the lights turn amber or red that it would be unsafe for the motorist to stop ahead of the line then they are permitted to cross the line and stop before the second line. Even with these exceptions, the motorist is still required to give a cyclist extra time and space to be able to move off ahead of them.