I almost exclusively ride MUPs as I just don't want to hassle with traffic at my age. There will always be a speed issue, but to be honest when I was younger I went out of my way not to ride MUPs. I used to be embarrassed to ride on a MUP as those trails really were never designed for any serious cyclist.

I have to admit, I have ridden some of them too fast, never endangered anyone, but definitely not safe. I disdain anyone who is running Strava on a MUP. They need to man up and ride with the big boys.

John