The National Trust, which owns the beach, hopes the zones will improve safety.
Some extreme sports enthusiasts have said the measures are too harsh.
However, the trust claims that even during the day two thirds of the beach will still be available for extreme sports.
Bicycle Motocross, as it is officially called, has its origins in the garages of suburban America, where the forerunners of the sport took apart bicycles then reassembled them as the first dirt bikes. From those early days of the 1970s, BMX was essentially a revolt against an America of Little League and Pop Warner football.
That, [...]