Yep, it's all about that 90 degree angle! Daughter and I both have hit the pavement on a set of track I have to cross everyday. They are real tire eaters crossing the road at about a 60 degree angle and are usually covered with sand and gravel. If there's no traffic I can swing into the road to straighten out my angle. If not I get off and walk across them. I always feel kinda wimpy walking across but it definitely hurts when you hit the ground. bikerHen