Sometimes the simplest questions can make you think. I was asked if radar detectors were legal in British Columbia by a work experience student I had taken out on patrol. The answer is, yes, they are.
The student paused to think this through. Speeding is illegal was the next observation. Yes, that's true also.
I have just returned from a visit to Montreal, and driving behaviour that I saw there gave me a lot to think about. No one came to a full stop at a stop sign unless it was to avoid a collision with traffic already there. If you did stop and did not immediately proceed, the driver behind you honked the horn. 
Most of us drive vehicles that use gasoline for fuel. If you are like me, we probably notice the signs at the pump island that tell us to stop our engines before refueling but don't give it much more thought than that. Perhaps the reader that suggested this topic is doing us all a favor.