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Lighting Calculations

Road surface reflection classes R2 and R3 and the wet road case in EN 13201

The road surface reflection class is a design decision carrying the same weight as spacing: what Q0 and S1 describe, when the wet surface check is required, and why calculation and field measurement diverge.

Studio illuminotecnico con planimetria, ottiche e simulazione della luce
Studio illuminotecnico con planimetria, ottiche e simulazione della luce. Immagine illustrativa generata con AI.

Summary

The road surface reflection class is a design decision carrying the same weight as spacing: what Q0 and S1 describe, when the wet surface check is required, and why calculation and field measurement diverge.

Topics

  • road surface reflection coefficient
  • R2 R3 road lighting classes
  • Q0 S1 luminance coefficient
  • wet road surface EN 13201
  • road surface luminance calculation
  • luminance meter commissioning

Category

Article from the Lighting Calculations section. Reading time 8 min. Updated on 2026-09-21.