Mich. Admin. Code R. 408.13708 - Lettering

Rule 3708.

(1) A letter shall be block style, upper case for the upper panel, and upper or upper and lower case for the lower panel.

(2) Letter size shall be determined by the length of the message and maximum visibility and readability. See table 1 for a guide for minimum letter height at safe viewing distance.

(3) Table 1 read as follows:

TABLE 1

Minimum	Viewing Height of	Distance Letters	(Feet) (Inches)
5 ...............................................	200-250	4
1/2 ...........................................	150-200	4 ...............................................	120-
150	3 1/2 ...........................................	105-120
3 ...............................................	90-105	2 1/2 ...........................................	75-90
2 ...............................................	60-75	1 1/2 ...........................................	40-60
1 ...............................................	30-40	3/4 .............................................	20-30
1/2 ............................................. than 10	10-20	1/4 .............................................	Less

Notes

Mich. Admin. Code R. 408.13708

1979 AC; 1983 AACS

1: Crowding of letters and words reduces legibility.

2: A rule-of-thumb of 35-40 feet viewing distance per inch of letter height may be used for heights of letters greater than 5 inches.