Bingo! That's a pretty bad dropoff there and my favorite wife's neck is getting progressively worse, doesn't turn as well, so I built something she'd have trouble getting through. The ties are 16 feet long and about 300 lbs each, and I have them high enough she'll feel them with her bumper instead of just hitting them with a tire. I'm planning for them to initiate snow drifts the length of the driveway this winter too, so even when they're buried they'll still do their job. I'm thinking of driving rebar down through them, I'll see how they hold up after they get hit a few times.
You know what would be cool.... to wrap rope lights all along there this Christmas! Yeah!