Late last year I was booked for doing 45 in an 80 zone at 2:40 pm because the school zone operated from 2:30 pm, when the limit dropped to 40. It was on a road I don't normally use and was unaware of the school zone. My watch is one where you have to press the button to activate the display for 20 seconds, and touching an electronic device, including a watch, while driving, is a finable offence. I didn't realise it was after 2:30. Schools don't get out until 3:15. My daughter is a school crossing supervisor, and doesn't leave home till after 3:00.