Section 4: Sign Legends
Introduction
The sign legend includes all text messages (words and numbers) and symbols intended to convey specific meanings. For purposes of design, borders are included as part of the sign legend. To allow drivers time to understand and respond to the message, the legend and any accompanying symbols must be simple and clear. The size and spacing of letters and symbols is also critical to sign legibility.
(SHSD) details dimensions and letter spacing for all standard signs in the (TMUTCD). If a special sign is needed, the Texas Department of Transportation (TxDOT) Traffic Operations Division (TRF) can assist in the layout of the text.
Font Types
TxDOT uses two alphabets for signs. The alphabet types include
the Federal Highway Administration (FHWA) Standard Highway Alphabets
and Clearview.
The Standard Highway Alphabets is contained in the national (SHSM) manual. TxDOT
has adopted a version of this book and also published this alphabet information
in the Texas
.
The height of the letters, spaces between words, spaces between lines
of words, and various other details are described in this document.
This document provides details for six standard capital letter alphabets,
Series B through F, including Emod.
In 2003, TxDOT implemented the use of Clearview font for overhead
and ground mounted guide signs. This includes all signs manufactured
with a white legend on a green and brown background and some that
include a blue background. Research findings indicate that Clearview
provides increased legibility and reduces glare when used with prismatic
sheeting.
The TMUTCD requires that the Texas
be
used for all sign designs for consistency and standardization. The
Texas SHSD and the
show the appropriate letter series
for each sign using either of these fonts.
Symbols
The use of symbols for signs has become a major element in
driver communications. Symbol signs can be interpreted at a glance
without the need to read a word message. The
illustrates the
symbols approved for use on signs.
Application Methods
Legends can be applied in several ways, depending on the sign type. The following table explains the various legend application methods.
Type of Sign | Normal Methods of Legend Application | |
---|---|---|
Regulatory, Warning, Route Marker |
| |
Small Roadside D-Series Destination Signs |
| |
Large Roadside and Overhead Guide Signs |
|
Details regarding application methods are provided in the
(TSRs).