The problem came to light after incidents at one site in Lancashire. But motoring groups fear that phantom flashes could affect most of the 6,000 speed cameras around Britain.

• 在英格兰西北部兰开夏郡某处发生的一起事故暴露了这个问题，开车兜风的人担心在英国约6000台电子监控设备受到波的反射影响而给出错误的读数。