Many owners of trucking companies use electronic communications equipment to monitor their drivers on the road. They say the devices allow them to remain competitive and to serve their customers better by delivering shipments of vital materials exactly when their customers need them. They also point out that the equipment can improve road safety by ensuring that drivers get the hours of rest the law requires. Opponents argue that the surveillance devices work against safety. "The drivers know they're being watched," says one trucker. "There's an obvious temptation to push." What do you think about this practice