Let's say a vehicle enters an inactive school zone going exactly the speed limit of 30mph. Then the school zone (20mph) turns on while the vehicle is still inside.
What is the current speed limit for that driver?
If it is 20mph, is there any allowance for drivers to adjust their speed or are they instantly breaking the law?
My interpretation has been that the speed limit remains 30mph in this case for the vehicles that entered an inactive school zone.