Whitaker, winner of 14 major championship medals, including Olympic silver at the 1984 Los Angeles Games, pulled both his entered horses, Ingliston Twister and VIking V, from Hickstead's Queen Elizabeth II Cup and the Speed Classic on Saturday.

BBC: Whitaker 'very sorry' after hotel incident at Hickstead

The scheme will initially be piloted on Thamesdown Drive - where 67% of vehicles exceed the limit - and Queen's Drive - where 38% of vehicles speed.

BBC: Swindon traffic lights to slow speeding drivers

She estimated she was travelling at between 30mph and 40mph but Eric Lamb prosecuting argued she drove at "excessive speed" and caused the death of Miss Ashworth, a pupil at King Edward Queen Mary School, Lytham, with her dangerous driving.

BBC: Blackpool fatal crash driver 'used excessive speed'