Question: My question is about speed limit signs. When I see the sign does it mean I go that speed now or when I get to the sign? I’ve driven for 30 years and often wondered about that. Answer: When a ...

So, a camera-based system might miss a sign, or a GPS-based system may not know that a speed limit has recently changed, Lee said. “It can be wrong,” Lee said.

The specific rules vary by province, but generally, if there’s a speed-limit sign in a construction zone, you have to follow it, whether crews are there or not.