2. When you originally presented the story, you said the guy was driving into Manhattan from Teaneck, but the version in the link you provided had the guy driving out of the City to the Catskills.
Frankly when i originally posted the story it was from memory, I later googled it, but frankly it doesnt really matter which way he was going as the driver went to Washington Heights to a friends house.
I dont think its legal to abandon a car on the Bridge, signs say STAY IN YOUR CAR. the reasons are 2 fold one is safety and the other is terrorism (The busiest bridge in the world is a prime target for terrorism)
Is it possible the story was embelished, Of course, but the gist is he abandoned the car and since this is a fairly common occurance you would think the police would have a good idea where the body went when the person jumped