As always, the answer is "it depends." It depends on the MUP, the time of year, the day of the week, the time of day. Most weekday mornings our MUP, the American River Bike Trail, is a bike highway and most of the users are commuting, training, or both. It's a pretty skilled and experienced group. There are a few early morning runners, but they know the drill.

But the same path on a summer Saturday morning is an absolute zoo: young families, marathon training groups, Cat 6 racers, dog walkers. I avoid it at all costs those times.