LOOK BOTH WAYS BEFORE TAKING FIRST STEP Martin Scorcese’s 1973 film Mean Streets is a story about a small-time hood who struggles to survive on the rough and tumble streets of New York.   But unlike the Academy Award-winning director’s tale of a young thug trying to work his way up the ladder in the local Mafia, when top New York pedestrian car, truck and bus accident lawyer Jay Dankner refers to the city’s “mean streets,” he’s talking about the dangers