The trap can presumably be on either side, but I’ve seen it most often on the westbound side behind a concrete abutment associated with supporting bridge columns. The officer — in my case it was a Monroe (not West Monroe) city policeman, but state troopers also man this location — hides his vehicle behind the cement wall and uses his laser or radar instrument from partial concealment. The 60 mph limit is unreasonable here on the outskirts of West Monroe. A 70 mph limit is maintained all the way through Ruston less than half an hour away on the same Interstate and a business district much busier than this area.