Driving north over the viaduct, they sit at the Canal St. intersection with radar. The viaduct is arched, and you could be sailing over it and not see them until it’s too late. Speeders get nailed left and right. It’s a nice, smooth 4 lane viaduct with no stops, so it’s easy to exceed the limit of 30 mph. I think they want your money before you get a chance to lose it at the casino on canal street.