Chapter 5: Lighting Equipment

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Section 1: Overview

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This chapter contains definitions and explanations of the equipment used in highway illumination.

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Current TxDOT highway lighting specifications are contained in both of the following:

  • the Standard Specifications for Construction of Highways, Streets and Bridges
  • Roadway Illumination Details (RID), High Mast Illumination Details (HMID), and Electrical Details (ED) contained in TxDOT’s Traffic Operations Standard Plans.

These documents specify the various hardware components of a lighting assembly, together with the photometric and testing requirements of the lighting units and related equipment.

These documents are available from TxDOT. See References, in Chapter 1, Section 1, for address.

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AASHTO Guidelines

The American Association of State Highway and Transportation Officials (AASHTO) offers two publications relevant to lighting system design.

  • Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals deals with structural materials and design. This book also covers the breakaway requirements for light poles.
  • An Informational Guide on Roadway Lighting provides guidelines for the amount of light and the uniformity of light in roadway lighting systems. TxDOT design standards and warrants are derived from this guide.

These documents are available from AASHTO. See References, in Chapter 1, Section 1, for address.

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IESNA Guidelines

The Lighting Handbook Reference and Application published by the Illuminating Engineering Society of North America (IESNA) offers equipment guidelines. The publication is available from the publisher. See References, in Chapter 1, Section 1, for address.

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Non-standard Lighting

Non-standard lighting systems should meet AASHTO, IESNA, or International Commission on Illumination (CIE) requirements.

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