See that's not easy to find at night. That's what I was saying earlier, he either was familiar with the area, scouted it out in the daytime or just happened upon it. More likely one of the first two choices.
Possibly familiar. But, what if he just knew of the exit and knew it was desolate. But not from the Acadiana area. He gets off there, but doesn't know exactly where to dump the bike. Will put it in the river if he can get close enough to the water. He feels exposed parking right there by the bridge. Never know if someone will drive by. The state patrol might periodically check it during the night. So, feeling exposed he drives a bit up the state highway and comes across a driveway. It IS the first driveway you pass. Its dark, no lights. No one home. Drives up to bank and heaves the bike into the water. The hauls *advertiser censored* back to I-10. It could have just been fortuitous.