I like the idea, but that's a LOT of bridges that are marked (and unmarked) with weight limits. On top of that, a lot of the road segments are one continuous segment over the bridges (creeks) and don't get separated out, so a road segment that's 5 miles long be rated for 5 tons and under for a bridge that's only...500 feet long...that's a lot of road marked as "do not travel for trucks" but then again...that is the purpose.
I've had an idea of being able to add the vehicle type you're driving, that way if you're driving an 18-wheeler, Waze won't direct you down a residential neighborhood to avert traffic, but haven't figured out how it would do that, thus I haven't presented it to anyone, yet.