In a letter to the editor, Casey Jones, the Director of the Parking and Transportation Division at the University provided some clarifcation to the 5 mph bicycle speed limit. He states…
The new 5 mph speed limit does not apply to every sidewalk on campus but only those designated as pedestrian safety zones. Pedestrian safety zones have been established to reduce the risk of injury to pedestrians, skateboarders and bicyclists along CU-Boulder’s sidewalks. Currently marked as “dismount zones,” pedestrian safety zones are portions of the CU-Boulder sidewalk system where bicycle riding, skateboarding and personal transportation devices are restricted. New signs will replace the “dismount zone” markings.
The 5 mph speed limit within pedestrian safety zones is in effect between 7:30 a.m. and 5:30 p.m., Monday through Friday except during class change periods. During class change periods, bicyclists, skateboarders and persons using personal transportation devices must dismount or not exceed 5 mph.
Seems like some common sense in action, although the 2nd paragraph still leaves me slightly confused.