This was shot doing about 50mph in Tucson. I had setup my tripod inside my truck with plenty of room to drive. Hooking up the cable release to the Canon 30D made driving and taking photos very easy. What you see here in the photo is approximately a half to three quarters of a mile for the exposure. The hardest part of doing this, especially in a 4x4, is finding a smooth road. I had taken many shots during this particular night and it wasn't until I had called it quits and was on my way home, that I captured this.