However, skyways and above-ground indoor walkways give pedestrians other options in select places. Sometimes they were planned, sometimes they weren't. But if you look at the overall connections between buildings, a few strategic connections would tie what's there together very well. You could make a system out of it. Other problem areas include the lack of common operating hours.
Access is restricted in lab areas, such as the veterinary teaching hospital.
Furthermore, many tunnels are not consistent with the building hours that they connect. And although some might use the tunnels to escape from the winter cold, many of the tunnels are not heated. In identifying the routes, one significant issue has been disability access.