Of course motorists have speed limits, but this discussion isn't about speed limits, it's about design speed.

Where a street is planned for a 35 mph speed limit, it has longer sight distances than a street designed for a 25 mph speed limit. If you design a street for 25 mph, then post a 35 mph speed limit, you cause accidents.

Seattle does not have a legal speed limit for trails, so riders would be allowed to ride any speed they want on the Westlake path, but it will be designed to be dangerous for riders moving faster than 10 mph.