For unusual geometrics or lighting conditions, use the ALADAN program, or an equivalent, to determine the lighting layout and illumination levels. The figures in this article show configurations for many typical situations. The areas of potential vehicle conflict as described above are lit to a maintained intensity of 0.6 fc (6.5 lux) or higher. High mast lighting in complex interchanges shall provide an average maintained intensity of 0.6 fc (6.5 lux) and a minimum intensity of 0.2 fc (2.2 lux) on all paved driving surfaces within the interchange. Guidance is available for luminaire locations for typical on and off ramps to maintain required intensities. Areas of potential vehicle conflict including exit gore areas, the ends of acceleration lanes, ramp merges, ramp diverges, weaving areas, ramp terminal intersections, etc. 901.1 Basic Lighting at Diamond Interchanges, Fig. Examples of interchange lighting are shown in Fig.
If an intersection contains one or more divisional islands or channelizing islands with non-mountable curbs, all luminaires are to be located for direct reflectance lighting.īasic lighting at interchanges provides an average maintained intensity of approximately 0.6 fc (6.5 lux) or more in the areas lit. Mixing silhouette discernment and direct reflectance lighting is not recommended. Proper lighting of island noses may also dictate mounting height and luminaire size in an intersection. Guidance showing the limits for various mounting heights and luminaire sizes for direct reflectance and silhouette discernment lighting is available. 901.7.2 Typical Lighting for Signalized Intersections. 901.2.1 Basic Lighting for Unchannelized/Unsignalized Intersections and Fig. 901.1.2 Basic Lighting for Signalized Interchange, Channelized Intersections, and Roundabouts, Fig. Guidance for lighting of typical island noses is available.Įxamples of lighting configurations are shown in Fig. The approach noses of all divisional islands and channelizing islands with non-mountable curbs shall be lit to a minimum intensity of 0.2 fc (2.2 lux) on the vertical face of the island. Continuous lighting installations on existing roadways, not including freeways, urban arterials, expressways or ramp connections thereto shall provide an average maintained intensity of 0.4 fc (4.3 lux) and a minimum intensity of 0.2 fc (2.2 lux).īasic lighting at intersections, including ramp terminals at crossroads, shall provide an average maintained intensity of 0.6 fc (6.5 lux) and a minimum intensity of 0.2 fc (2.2 lux) within the limits of the intersection. The average maintained intensity is the average level of horizontal illuminance on the roadway pavement when the output of the lamp and luminaire is diminished by the maintenance factor.Ĭontinuous lighting installations along freeways, urban arterials, expressways, and ramp connections thereto shall provide an average maintained intensity of 0.6 fc (6.5 lux) and a minimum intensity of 0.2 fc (2.2 lux). Luminaire selection and use are as identified in MoDOT’s standard plans and specifications. LED luminaires are used for fixed source lighting of roadways.
4 901.7.4 Adaption (Transition) Lighting.1 901.7.1 Light Emitting Diode (LED) Luminaires.
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