There was one time I could have used one. We did not have a backrest, and were traveling down the interstate. I put my elbows on my husband's shoulders and fell asleep. He had to reach behind as I started to slide a little sideways. Scared us both, and after that he would never let me put my elbows on his shoulders again. Then he always knew when I fell asleep when my helmet hit his. That is one of the reasons I love my trike, I never fall asleep when riding on my own.