Yes, there are. I know a woman who was overdue. She tried curb walking as recommended by her midwife. After just a few days of regularly walking on the curb (alternating which foot was on the curb), she started having contractions and soon went into labor successfully.
Sure. My friend was nearing her due date and was really eager to start labor naturally. She decided to do curb walking. Curb walking is believed to help the baby get into a better position for birth. In her case, she walked on the curb for about 30 minutes each day for a couple of days. And it worked! She had a normal and healthy delivery. It might be because the uneven surface of the curb helps in moving the baby down and also encourages the body to start the labor process.