This is the curve that Uwe went over. He went into the grass between the 1st and 2nd white pole. Knocked down the 2nd one, but it popped back up. He went one the cliff side of the 3rd one, then went over the gravel and rocks and down the cliff just passed the 4th white pole. They are made of this metal, and spring back up if you hit the poles. This spot is about 25 miles South West of Healdsburg, CA.