Outdoor lighting installed by the Illinois Department of Transportation must follow strict control requirements.

The Illinois Department of Transportation must ensure that all new outdoor lighting installed on its properties complies with the Responsible Outdoor Lighting Control Act. This includes shielding luminaires, limiting light trespass, and using reflective markings. Luminaires must emit less than 1% of light above 80 degrees from the downward vertical direction and avoid exceeding one lux at ground level. Color temperature must be no more than 2,700 Kelvin, and lighting must be minimized to no more than 25% above ANSI/IES standards.

Outdoor lighting installed by the Illinois Department of Transportation must follow strict control requirements.

The Illinois Department of Transportation must ensure that all new outdoor lighting installed on its properties complies with the Responsible Outdoor Lighting Control Act. This includes shielding luminaires, limiting light trespass, and using reflective markings. Luminaires must emit less than 1% of light above 80 degrees from the downward vertical direction and avoid exceeding one lux at ground level. Color temperature must be no more than 2,700 Kelvin, and lighting must be minimized to no more than 25% above ANSI/IES standards.