note
Lm= average road surface luminance (of a carriageway of a road)(cd/mq)
Uo= Overall uniformity (of road surface luminance)
UI= Longitudinal uniformity (of road surface luminance of a carriage way)
TI= Threshold increment (%)
SR= Surround Ratio (of illumination of a carriageway of a road)

Ev= Vertical plane illuminance (lx)
Ehs= hemisferical illuminance (lx)
Esc= semi-cylindrical illuminance (lx)

http://www.energy.itu.edu.tr/epy/pubs/p4-7.pdf