Tunnel Diagramming

The NoPileups Stop Summary

An example tunnel diagram.

Planning camera placement early can save a lot of hard work during installation. A simple tunnel diagram will help identify potential obstructions and other useful info.

If you ever need help completing a tunnel diagram, contact the NoPileups Service Team. Understanding the tunnel layout is important to making sure NoPileups catches every incident, so we want to get even the small details right.

Here’s how to create a tunnel diagram:

  • Lay Out the Tunnel — For the diagram, begin by marking the tunnel’s entrance, exit, and windows. Also, mark the location of the enter eye. Next, mark any obstructions, like equipment, that would block a camera’s view of a vehicle (see Dealing with Camera Obstructions).
  • Plan the Cameras — Start by marking one camera (both location and field-of-view) near the enter eye of the tunnel. Once completed, begin marking cameras every 20 feet, so that:
    • The FOV for each camera overlaps with the previous by 2-3 feet. This allows for smooth tracking and makes NoPileups even more accurate. Additional overlap is fine.
    • The camera FOV is not severely blocked by the marked obstructions. NoPileups can’t track what it can’t see. Place cameras so at least one can see every portion of the tunnel.
    • No camera is placed opposite any windows in the tunnel. Glare can blind NoPileups, so avoid placing cameras in locations where outside light will interfere.
    • Every camera can be mounted 10-14 feet high. Ideally, each camera should be placed above the “water line,” where water, soap, and other spray does not often reach. Cameras can be mounted at different heights if needed.
  • Plan the Cable and Conduit — Sketch out where cable and conduit lines will be running to avoid confusion once you begin mounting cameras.

Good to know!

Cameras can be mounted on both sides of the tunnel. Coverage and visibility are the most important factors for camera placement