This is often difficult to determine. Factors include proximity to generators such as schools, parks, shopping centers, places of employment and residential areas. The ratings are not absolute, but should be compared to other facilities in the area. Not every obstacle to bicycling or walking is identified, only the most common ones. There may be other situations that can act as obstacles.
Good design encourages responsible use and increases safety.
This reflects the need to ensure that project costs are in line with standard practices. Some projects might appear very expensive for the length constructed, but can provide a missing link in a longer corridor, bridge an obstacle or remove a deterrent to walking and bicycling. Both bicyclists and pedestrians need access to roads and streets. Projects in urban areas should provide mobility for both modes, and connect to other modes, especially transit, where available.