Worsfold v Howe (1980)
A car driver wished to turn right from a minor road in 
order to proceed South on a major road. A petrol tanker travelling North stopped leaving a gap. The car driver’s view of traffic on the northbound lane was obscured because of the position of the tanker. The car driver began to edge forward past the tanker. He was struck by a motorcyclist filtering past the tanker within the North bound lane.
Car Driver 50% to blame Motorcyclist 50% to blame
There is no principle of law which entitles a driver to emerge blind from a minor road onto a major road by inching forward beyond his line of vision, even if he did so slowly.