You MUST stop when signalled to do so by ........? - Cliff Pope
A workman digging a trench across the road
Armed vigilantes at a road block
Injured man lying in road waving frantically
Swing bridge operator
Customs and excise checking for red diesel
Wife waving forgotten shopping list
You MUST stop when signalled to do so by ........? - The Nut
That's not the only error on that page, Q54 is about what to do if the lights start flashing when you are on a level crossing. The answer is right but the explanation is about speed limits when towing a trailer.