How do you foolproof keep an A.I. Engineer from taking a spur that leads to a dead end? I have a "drive to" marker not an eighth of a mile down the track, but he just yawns and pretends it's not there and insists on taking the dead end spur, which leads to a stop and the "exclamination point."
				
			 
	 Place a bumper at the end of the siding...most have a red signal.
 Place a bumper at the end of the siding...most have a red signal.