[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR393.63] [Page 1077] TITLE 49--TRANSPORTATION CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 393--PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of Contents Subpart D--Glazing and Window Construction Sec. 393.63 Windows, markings. (a) On a bus manufactured before September 1, 1973, each bus push- out window and any other bus escape window glazed with laminated safety glass required in Sec. 393.61 shall be identified as such by clearly legible and visible signs, lettering, or decalcomania. Such marking shall include appropriate wording to indicate that it is an escape window and also the method to be used for obtaining emergency exit. (b) On a bus manufactured on and after September 1, 1973, emergency exits required in Sec. 393.61 shall be marked to conform to Federal Motor Vehicle Safety Standard No. 217 (Sec. 571.217), of this title. (c) A bus manufactured before September 1, 1973, may mark emergency exits to conform to Federal Motor Vehicle Safety Standard No. 217 (Sec. 571.217), of this title in lieu of conforming to paragraph (a) of this section. [37 FR 11678, June 10, 1972]