We get a lot of questions reguarding the size and specifications of truck and boat registration numbers, so I tracked down the following information.
For Truck Numbers:
Federal Register / Vol. 65, No. 107 / Friday, June 2, 2000 / Rules and Regulations
(c) Size, shape, location, and color of
marking. The marking must—
(1) Appear on both sides of the selfpropelled
(2) Be in letters that contrast sharply
in color with the background on which
the letters are placed;
(3) Be readily legible, during daylight
hours, from a distance of 50 feet (15.24
meters) while the CMV is stationary;
(4) Be kept and maintained in a
manner that retains the legibility
required by paragraph (c)(3) of this
Watercraft Identification & Display of Tags and Number (OAC 1501:47-1-07 & ORC 1547.57)The number assigned is in three parts beginning with "OH" followed by four numbers and two letters.
The number shall:
be placed on each side of the forward half of the watercraft;
read from left to right;
be in block characters of good proportion;
be a minimum of three inches in height;
contrast with the background or boat color;
be separated by a hyphen or equivalent space between the prefix and suffix;
be maintained to be clearly visible and legible.
No other numerals or letters may be displayed on the bow.