Letter shapes, spacing, standard signs, and symbols used in GuideSIGN signs are based on the following published standards:

U.S. Standards Sources

Standard Alphabets For Highway Signs and Pavement Markings, Metric Edition

U.S. Department of Transportation

Federal Highway Administration

Office of Traffic Operations

1977 (Reprinted 1982)

Standard Alphabets For Traffic Control Devices

Is a part of the Standard Highway Signs book - 2004 Edition

Prepared by the Federal Highway Administration

Standard Highway Signs

U.S. Department of Transportation

Federal Highway Administration, 1979

Standard Highway Signs

2004 Edition

Prepared by the Federal Highway Administration,

Manual On Uniform Traffic Control Devices

U.S. Department of Transportation

Federal Highway Administration, 1988

Manual on Uniform Traffic Control Devices (M.U.T.C.D.)

2003 Edition

Prepared by the Office of Transportation Operations, Federal Highway Administration and U.S. Department of Transportation

Manual on Uniform Traffic Control Devices (M.U.T.C.D.)

2009 Edition

Prepared by the Office of Transportation Operations, Federal Highway Administration and U.S. Department of Transportation

California Standards Sources

Traffic Manual

State of California Dept. of Transportation, 1993

California Style Fonts

State of California Dept. of Transportation, 1951

Canadian Standards Sources

Manual of Traffic Control Devices For Canada

4th Edition, 1998

Uniform Traffic Control Devices For Canada

Sign Pattern Manual, Reprint #4, 1993

Australian Standards Sources

Road Sign Specifications

Standards Australia, AS 1743 - 1992

Standard Alphabets for Road Signs (metric units)

Standards Australia, AS 1744 - 1975

Australian Standard

Standard alphabets for road signs

Second edition AS 1744:2015.

Standards Australia Limited, 04/14/2015

Throughout this manual the above publications are referred to collectively as The Highway Standards. The sources above are used for copies of GuideSIGN Plus sold in the respective countries. Copies sold in all other countries are based on the U.S. standards.