[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR234.217]

[Page 490]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 234--GRADE CROSSING SIGNAL SYSTEM SAFETY--Table of Contents
 
             Subpart D--Maintenance, Inspection, and Testing
 
Sec. 234.217  Flashing light units.

    (a) Each flashing light unit shall be properly positioned and 
aligned and shall be visible to a highway user approaching the crossing.
    (b) Each flashing light unit shall be maintained to prevent dust and 
moisture from entering the interior of the unit. Roundels and reflectors 
shall be clean and in good condition.
    (c) All light units shall flash alternately. The number of flashes 
per minute for each light unit shall be 35 minimum and 65 maximum.