What is the lettering height and spacing for a Political Boundary sign (NYI12-2)?

The sizes for the signs in the NYS Supplement to the MUTCD are shown along with a drawing in the appendix (SIGN DRAWING SD-G5 for the Political Boundary signs). The table with the drawing gives the letter heights, but not always the spacing between the lines. The dimensions vary depending upon the text, but there are a few rules that should be followed. The details can be found in the Standard Highway Signs and Markings Book which is available online. Be sure to check out the 2012 Supplement for signs with mixed-case lettering such as the Political Boundary signs.

Figure showing examples of the NYI12-2 political boundary signs

Here is a summary of the rules for signs such as the Political Boundary signs with the most common dimension given

Most common measurements for political boundary signs

Rule

Most common measurement

Lettering height

6 inches

Margin around the lettering

6 inches

Interline spacing

4.5 inches

Sign height

30 inches for 2 line signs (municipal boundaries)
18 inches for 1 line signs (hamlets)

Corner radius

3 ½  for 30 inch heights
2 ½ for 18 inch height signs

 

Most guide and information signs use these same rules. The only exception is street name signs which allow the margins around the lettering to be ½ the letter height. This makes the most common street name signs 12 inches in height (6 inch letters) for speeds above 30 mph. 

Thank you to Sally Olsen from NYSDOT for help with this Quick Answer.

Resources

Standard Highway Signs and Markings Book

Manual on Uniform Traffic Control Devices (MUTCD).
NYSDOT

New York State Supplement to the Manual on Uniform Traffic Control Devices for Streets and Highways (2009 Edition).(pdf)
NYSDOT

Cover of the Traffic Sign Handbook

Traffic Sign Handbook for Local Roads (pdf)

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