MUPS are Ok if you pick the right time of day. I would not plan on riding fast at the time the dog walkers are out. Middle of the day during the week is generally pretty quiet and early mornings on weekends. But even then MUPs generally have visibility issues. Use to ride them fairly often, none in my neck of the woods now so I am always on the street.
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The problem with the gene pool is that there is no lifeguard and the shallow end is much too large
2013 Noah RS