The pushback tug should not be parked at a 45 degree angle near the stopping point on the lead-in line. This generally puts the tug directly in the path of the jetway. Nothing should be parked in the vicinity of the jetway (usually have a protected area marked with RED lines)
The tug should be parked straight off the end of the lead-in line (in the same direction as the aircraft)
How many times must the moving jetway CRUSH the poor tug and driver!