Abstract Manager

The Cody Tunnel, located in Wyoming, serves as the state’s only road access to Yellowstone National Park.

In recent years, the increasing number of pedestrians and cyclists using this narrow tunnel has posed significant safety challenges, particularly in ensuring smooth coexistence with motorists. When the Wyoming Department of Transportation (WYDOT) decided to upgrade the tunnel’s outdated sodium lighting to modern LED fixtures, its engineers sought a fast and effective solution to enhance safety for all users.

At 975 meters (3,200 feet) long and carved directly into the rock, the bidirectional tunnel could not be easily expanded to accommodate a dedicated pedestrian and cyclist lane. Instead, a practical solution was implemented: a button installed at the tunnel entrance allows pedestrians and cyclists to activate the lighting system before entering, signaling motorists of their presence in the tunnel through a beacon luminaire. This feature is seamlessly integrated with the Supervisory Control and Data Acquisition (SCADA) system, which manages the tunnel's lighting.

This presentation highlights how Nyx Hemera Technologies’ TLACS (Tunnel Lighting Addressable Control System) has significantly improved safety for pedestrians and cyclists. In addition to controlling the lighting, TLACS oversees critical systems such as carbon monoxide detection, ventilation, air conditioning, and uninterruptible power supplies (UPS), delivering a comprehensive safety solution for all tunnel users.