No there are homeland security training programs of a more serious nature where truckers are taught to be observant for anything suspicious as they drive.
This is important since transportation is where terrorist has expressed an interest. Not to mention we also cross important areas, structures, bridges, etc.
Back to the type of stuff you are likely to be referring to though, no we don't get paid to call the police when we see drunk drivers, weed smokers, etc.
However, there are plenty of drivers who will call when such illegal and dangerous activity is going on, especially when the car is weaving noticeably across lanes and changing speeds, which is what draws attention to themselves and points out their danger on the highways in the first place.
Take care.
Update: I just checked the highwaywatch program that I had mentioned where truckers were being trained to....watch. It has been suspended. Just in case your curious of what it was about. http://epic.org/privacy/surveillance/spotlight/0206/default.html