This part does not prohibit a State from establishing and maintaining standards which are more restrictive with respect to directional and official signs and notices along the Federal-aid highway systems than these national standards.
[38 FR 16044, June 20, 1973, as amended at 40 FR 21934, May 20, 1975]
source: 38 FR 16044, June 20, 1973, unless otherwise noted.
cite as: 23 CFR 750.155