(a) The minimum vertical clearance for secondary state highways and low-use roads under railroads shall be 16 feet 6 inches.
(b) The minimum vertical clearance for primary state highways and interstates under railroads shall be 17 feet 6 inches.
(c) The Commission shall prescribe the lateral clearances between piers or underpass walls in accordance with WYDOT, railroad, and federal design standards.
(d) Crash walls shall be installed to protect piers adjacent to railroad tracks in accordance with the American Railway Engineering Association (AREA) Manual for Railway Engineering.
045-2 Wyo. Code R. § 2-5