Standards and recommended practices

The following standards and recommended practices should be consulted in completing the lighting plan:

• AASHTO, An Information Guide for Roadway Lighting (6). This is the basic guide for highway lighting. It includes information on warranting conditions and design criteria.
• AASHTO, Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals (7). This specification contains the strength requirements of the poles and bracket arms for various wind loads, as well as the frangibility requirements. All luminaire supports, poles, and bracket arms must comply with these specifications.
• IES RP-8: The American National Standard Practice for Roadway Lighting (8). This Recommended Practice, published by the Illuminating Engineering Society, provides standards for average-maintained illuminance, luminance, and small target visibility, as well as uniformity of lighting. Recommended illumination levels for streets with various classifications and in various areas are given in Exhibit 7-23.