The feature may not contain or be illuminated by flashing, intermittent, or moving lights, including any type of screen using animated or scrolling displays.

Luminaires must be shielded, directed, and positioned to prevent beams or rays of light from being directed at any portion of the traveled ways of a regulated highway.

The lighting may not be of such intensity or brilliance as to cause vision impairment of a driver of any motor vehicle on a regulated highway, or otherwise interfere with the driver's operation of a motor vehicle.

Illuminance levels shall conform to the recommendations in Chapter 26, Lighting for Exteriors, from the

Lighting features that are not crash worthy must be located outside the roadway clear zone or protected by a TxDOT approved crash barrier.

The lighting may not simulate, resemble, obscure, or interfere with the effectiveness of an official traffic sign, device, or signal.

When possible, cutoff luminaires should be used to minimize light pollution as called for in

Texas Health and Safety Code Chapter 425, Regulation of Certain Outdoor Lighting

.

For direct view sources like LED or neon, the aesthetic lighting should not exceed 0.3 footcandles over ambient lighting levels when measured according to the International Sign Association's .

For lighting designed to change appearance over time, the minimum length of time between changes of scene shall be either:

At least eight seconds; or
Calculated by the formula: Sight distance to lit area (ft) / Speed limit (ft/sec) = Minimum display duration (sec).

Lighting systems and Illumination levels should meet and conform with the applicable requirements of AASHTO, IES, the , BUG (Backlight, Uplight, Glare) ratings, the TxDOT , and other standards as deemed appropriate by the TxDOT District Engineer.