Radar speed sign in the UK, twenty miles per hour, happy smiley face as road users respect speed limit, cars and scooters driving in slow motion on a bright sunny day

radar speed limit sign light miles twenty mph fast slow happy smiley smile respect road street road user car truck scooter bright sunny clear blue sky london united kingdom england uk slow down flashing security surveillance measuring accident school zone safety police urban driving drivers cars transportation law speeding speed limit warning traffic slow motion