Video shows left to right. Consideration of the facts indicates he was driving south.

After looking at the map, I think the reporters must have gotten the NB / SB wrong. Runway 29 is off the southbound (westerly) side of I-95. If it hit a truck on the northbound side, its glide path would have taken it even closer to the road surface as it crossed over another ~150 feet of elevated road surface on the southbound side (3 lanes + 3 lanes + 2 lanes + a bunch of shoulder and median space, which I'm all together guesstimating around 13 lane widths, multiplied by at least 12 feet per interstate highway lane). A 3° glide slope (admittedly not a great assumption due to the erratic descent rates that others have pointed out) would result in a further 8 feet of descent going from the center divider to the west edge of the roadway. Assuming the truck cab is about 8 feet tall, that puts the wheels about at road surface level, best case. The west edge of the roadway has a ~6 foot tall concrete barrier when passing the end of the runway. I expect that barrier would have catastrophically damaged the landing gear, if not the engines.

The roadway light posts are also much taller on the northbound side - maybe twice the height of a semi truck. That suggests the damaged light post would be tall enough to strike the wing, which contains the fuel tanks. Though I suppose it's possible the jet was flying nearly level as it crossed over '95, clipped the roof of the truck as it flew between the tall light posts, but still hit one of the short lights (also with the landing gear I assume) on the southbound side.