For freeway lighting, TxDOT has standard spacings for conventional light poles to provide the minimum AASHTO-recommended illuminance levels. If higher light levels are needed, the spacing should be calculated with lighting design software.

50 ft. poles with 400W EQ LED luminaires may be spaced 270 ft. apart to provide the minimum recommended freeway illuminance levels. This will extend up to 60 ft. across the roadway from the luminaire. If wider roadways need to be lit, the spacing should be calculated with lighting design software.

40 ft. poles with 250W EQ LED luminaires may be spaced 220 ft. apart to provide the minimum recommended freeway illuminance levels. This will extend up to 50 ft. across the roadway from the luminaire. If wider roadways need to be lit, the spacing should be calculated with lighting design software.