Guy Street train bridge: a question

I was looking at comments on my post on the Guy Street bridge incident from yesterday. The city supposedly put up a large warning sign (I don’t see it on Streetview) but every now and then a trucker still wedges a rig under there, stopping not only road traffic but also commuter trains while CP sends engineers out to inspect the bridge. So I was wondering: do truckers rely on GPS? Does GPS give out any information besides routing? Could GPSes be programmed to have the voice say “Turn down Guy Street but do not take this route if your vehicle is higher than 3.5 meters”?

Of course, this would rely on truckers being aware of the height of their vehicles, but is this possible, or has it already been done and still falls down from time to time?