Crews from the District Department of Transportation have been working over several nights to install vehicle-detecting equipment at the busy intersection of M Street and Key Bridge. What does all this mean? First, it means a safer intersection, but there’s more. Along with the ability to count cars, the intersection will contain red-light and cross-walk cameras — and that includes the issuing of traffic violation tickets. Expect Key Bridge and M Street traffic to add to D.C.’s treasury in the coming months.