When I do light trails, the shutter speed is 20 to 30 seconds. I wanted to shorten it to just a couple, so you can actually see the vehicle making the light trail.
Above is a tractor trailer, pulling in to Wal Mart's parking lot, along Route 315 in Pittston Township.
Compared to just a general light streak shot, this technique is a lot more difficult. You have to time it just right and hope you get lucky. As you can see, this was not a morning for great luck.
Above is another tractor trailer turning left into Wal Mart's lot. I have some lights from a truck and the white swoosh of the trailer making its turn.
I experimented with shutter speeds between one and two seconds.
I'll keep trying.