Massachusetts Safety Commissioner Enforces GPS Use
These inspectors typically inspect amusement park rides. Management members of the inspector's union had previously agreed, but other public workers such as school bus drivers, some police officers, and snow-plow operators had not.
Massachusetts problem might be one of scope. Consider: the city of Cincinnati, Ohio, had announced in late 2005 that they would be equipping their snowplows with GPS devices. I think that the difference here is the perception of an invasion of personal space. A cell phone coexists in personal space; a snowplow does not. Tracking a cell phone = distrust; tracking a vehicle = probably alright.
Sources: [Boston Herald]