I've given it once, we were on a wide and mostly empty high way and we communicated the whole time. Like he'd tell me to stay down if there was a random car we passed, and I'd pause occasionally to make sure he was alright. We both had fun and for a dangerous activity, I felt like we did it pretty safely. Also before I started I warned him that if he felt like he was losing it at all, I wanted him to say something immediately.