Entire Bridge/Basin Bridge
On Interstate 10, between mile marker ~118 and 135. This is a 22 mile long bridge crossing the Atchafalaya Basin Swamp.
It’s a 60 mph auto/55 mph truck zone for the entire bridge. State troopers strictly enforce the limits using conventional radar and as of Spring 2010, I have seen them gathering multiple cruisers, with one of them standing outside of his, and aiming what appear to be a Laser detector at oncoming traffic.
The trucks no longer speed after huge accidents have killed many. They do not drive 56 mph! Motorists fare a little better, but not by much. Drive the speed limit of 60, and enjoy the scenery.