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How to design a roadside sign is a big subject, which includes select proper fonts and layout.

Sign Layout

Many signs have standard patterns with predefined parameters such as size, dimensions, letter sizes, etc. Others (and in particular guide signs), require a custom design dependent upon the individual message being displayed. The following are guidelines for the layout of those signs:
 

• Text and/or symbols should be ordered logically and balanced overthe face of the sign.
• The spacing between lines and text should be such that the sign is legible from a distance.

• The spacing between lines for mixed case text should be increased, so that the vertical strokes down below the line do not interfere with the upward strokes of the text below.
• A border should always be used.

• Lots of background should always be used to make the sign message clearly distinguishable.

It is important to note that extruded aluminum (which is used for the guide sign backing material) is manufactured in 305 mm(12”) strips. The size of the sign and the size of the spaces between the rows of a message should be designed so that the total sign depth is an equal increment of 305 mm wherever possible. Full panel widths should be used as cutting the aluminum strips into narrower pieces is not desirable. In general, guide and information signs should be laid out according to Figures 3.7 and 3.8, with spacing above and below the message.

Font Size

In order for a sign to be effective, it must be legible from a distance which allows a driver to read it, react to it and carry out any required maneuvers before reaching the sign. TAC’s “Supplemental Guide for Guide and Information Signage in Canada” and AASHTO’s “Manual of Uniform traffic Control Devices” states that for every 12 m of desired legibility, 25 mm of text is needed. An example is provided in Section A4.2.3.3 showing how letter height is derived based on desiredlegibility.
For guide and information signs, Table 3.3 should be used to determine the letter heights on signs on urban roadways and Table 3.4 should be used on rural roadways. Font sizes are given for several different types of messages. In fringe areas of cities the urban standard is typically used, because of higher volume and the expectancy that these highways will become urbanized.

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