(a) Public road agencies may install exempt crossing signs at an at-grade crossing when the track is relegated to inactive service.
(b) Exempt crossing signs shall comply with the MUTCD.
(c) Pursuant to W.S. 31-5-511(b), school buses are required to stop at all at-grade crossings, irrespective of the presence of an exempt crossing sign.
045-1 Wyo. Code R. § 1-19