![]() ![]() In addition to use on traffic signs, the Standard Alphabets are the official lettering specified by the Federal Aviation Administration for airside signing and markings on runways and taxiways, and are specified in Federal Motor Vehicle Safety Standards for lettering only, such as school buses. Illustration of Standard Alphabet Letter Series. The FHWA Standard Alphabet series letter forms are illustrated in Figure 2.1.įigure 2.1. Each of the Standard Alphabet letter series contains a full set of numerals and limited set of special characters including punctuation that correspond to the letter forms and stroke widths of that series. Series E(modified) uses the same letter forms and spacing as Series E, but has a wider stroke. Series A was previously discontinued because it was unworkable in manual fabrication applications. The Standard Alphabet letter series range from Series B, a narrow stroked and condensed letter form, to Series F, a broad letter form with wide stroke (see Figure 2.1). In addition, the width of the letter stroke, i.e., thickness, also increases with each series. ![]() Within the Standard Alphabets are six variations of letter typeface or styles, called "Letter Series." The letter forms of each letter series become progressively wider for a given letter height. "Positive" contrast is a lighter-colored legend on a darker-colored background "negative" contrast is a darker-colored legend on a lighter-colored background. The relative brightness of legend and background colors of a sign. The process of arranging combinations of letters and numerals to form words or numbers, and punctuation, to form phrases or sentences, along with the arrangement of those combinations on a common substrate. ![]() Standard Alphabet letter series include Series B, C, D, E, E(modified), and F. The complete set of letters, numerals, and characters and the spacing criteria that are used to compose individual words, numbers, and word combinations. The spaces between each pair of letters, numerals, or characters within the typeface. ![]() The complete set of characters or glyphs (letter forms). The shape or outline of a letter, numeral, or character. The collection of the letter forms (the shapes of each individual character) is commonly referred to as a "typeface." The specific spaces between combinations of letters within the typeface is a component of what is commonly referred to as a "font." In engineering terms, the "font" (the letter form and letter-pair spacing) is referred to as an "alphabet." Hence, the sets of standard lettering for traffic signing are referred to as the Standard Alphabets. These include the shape of the letter, i.e., the letter form, and the space between letter pairs within a word. The design of traffic sign lettering itself comprises several factors. Therefore, the lettering on traffic signs is designed for quick recognition, as are all design aspects of signs-these factors include the amount of information the size of lettering and any symbols contrast between the colors of the legend and background and spacing between words, lines of copy, and sign edges. By contrast, for drivers to operate their vehicles in a relatively safe manner, they must view traffic signs at highway speeds only through short glances, which requires them to take their eyes and concentration away from the road and traffic around them. This is because the reading process for traffic signs differs greatly from the task of reading another media which is typically done from a stationary position at a relatively close distance. Traffic sign lettering is optimized for rapid viewing and recognition at a range of traffic speeds and standardized so that signs can be designed to perform based on the short available viewing time by drivers. Table of Contents Report on Highway Guide Sign Fonts 2.0 Background 2.1 Introduction to Traffic Sign Lettering ![]()
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