MUTCD 11th Edition (2023)
Section 2E.10 — Retroreflection or Illumination
Manual on Uniform Traffic Control Devices, Section 2E.10. Standards, guidance, options and support statements, with figures and cross-references.
Section 2E.10 Retroreflection or Illumination Standard: 01 Letters, numerals, symbols, arrows, and borders of all guide signs shall be retroreflective . The background of all guide signs that are not independently illuminated shall be retroreflective. Support: 02 Where there is no serious interference from extraneous light sources, retroreflective post-mounted signs usually provide adequate nighttime visibility. 03 On freeways and expressways where much driving at night is done with low-beam headlights, the amount of headlight illumination incident to an overhead sign display is relatively…
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