MUTCD 11th Edition (2023)
Section 2L.03 — Legibility and Visibility of Changeable Message Signs
Manual on Uniform Traffic Control Devices, Section 2L.03. Standards, guidance, options and support statements, with figures and cross-references.
Section 2L.03 Legibility and Visibility of Changeable Message Signs Support: 01 The maximum distance at which a driver can first correctly identify letters and words on a sign is called the legibility distance of the sign. Legibility distance is affected by the characteristics of the sign design and the visual capabilities of drivers. Visual capabilities, and thus legibility distances, vary among drivers. 02 For the more common types of CMS, the longest measured legibility distances on sunny days occur during mid-day when the sun is overhead. Legibility distances are much shorter when the sun…
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