Back in the '60s & '70s, the surplused MVs used the so-called cateyes. Like my M37 & M211/135s. Also many others. They had a durable cast aluminum housing that was water proof/vibration proof, with BO/cat-eye lens. The cops didn't like them much because the cat-eye was pretty small. Somewhere much more recently a plastic aftermarket full lens became available that lends itself well to roadwork, but not much else, unless they are mounted in a well protected spot.