Traffic. Central NJ is so overdeveloped that even in the middle of the day it can take me 15 minutes just to get across town. And because of the huge volume of traffic, there are traffic lights everywhere. So even if the roads are clear it takes a long time to get anywhere. Drive a few blocks, maybe a quarter mile, then wait at a light. Rinse, repeat.
Pretty soon they'll probably have to put one in at the end of my street. The connecting road had to be widened to 4 lanes years ago. If I try to go anywhere during rush hour, I can be sitting at the intersection for a couple of minutes just trying to make a left turn.
It's so bad in some places that you have queue up just to get out of a parking lot. Praise Satan that I don't have to do a lot of driving or you'd probably see me on the news in the context of some road rage incident - like the guy I read about a couple days ago who was arrested for attacking someone with sword during a parking space dispute.
Oh, and don't get me started on parking. The nearest town/city has multiple high rise parking decks and even those can fill up on a weekend night. Finding a spot on the street is like finding a winning lottery ticket.