Providing complete separation of pedestrians from motor vehicle traffic.
Providing crossings where no other pedestrian facility is available.
Connecting off-road trails and paths across major barriers.
Use sparingly and as a measure of last resort. Most appropriate over busy, high speed highways.
Pedestrians will not use if a more direct route is available.
Lighting, graffiti removal and security are also major concerns with underpasses.
$500,000–$4 million depending on site characteristics.