It runs all the way down, flanking both sides. I pretend it's a moat for protection. So lush in some places it's difficult to not touch with your car as you drive along.
Pro-tip, switch to left-handed whacking when there's poison Ivy. It then flings the noxious juice away from you instead of at your legs. Long-pants also help. And, if you know for sure you screwed up and got some on you, immediately go inside, take a shower, and wash it off with soap.