The National Electrical Manufacturers Association (NEMA) published ANSI C136.27 American National Standard for Roadway and Area Lighting Equipment—Tunnel and Underpass Lighting Luminaires.
 
This standard covers luminaires used for illuminating roadway tunnels and underpasses. Requirements in this standard are limited to general attributes of tunnel luminaires due to the wide variety of designs possible. Based upon the state of the industry, updates to referenced documents, terminal block, terms and definitions have been made in this 2012 edition.

View the contents and scope of C136.37-2012 American National Standard for Roadway and Area Lighting Equipment—Tunnel Lighting and Underpass Luminaires. A hard or electronic copy may be purchased for $46 by visiting www.global.ihs.com, or contacting IHS by phone at 800-854-7179 (U.S. only) or 303-397-7956 (international).
 
NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Arlington, Virginia. Its member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Worldwide annual sales of NEMA-scope products exceed $120 billion.