Trucks are easily the most dangerous threat for cyclists in a city (more than cabs I would argue).
When they turn right, they often can't see what is next to them, and they are deceptive because they appear to be going straight but then suddenly veer right, and can easily knock an unsuspecting cyclist down under their back wheels.
If you are a cyclist you should _never_ be next to a truck while crossing an intersection. Even if they are slow off the line, always follow behind, it's just not worth it to try to pass them..
