The basic guidelines for private road signs are as follows:
Height of Sign "blade": Minimum height 8"
Height of Lettering: Minimum height 4" Upper case and lowercase letters (length of sign blade will depend upon the length of the name)
Color of Sign: Blue background with white letters
Retroreflective materials, as per Manual of Uniform Traffic Control Devices (MUTCD) as published by the NYS Department of Transportation.
Pole: Ground mounting post must be 3 feet, with 4" above ground, not in concrete
Sign post attached to ground post: Minimum height from ground to bottom of sign is 7 feet