[Code of Federal Regulations]

[Title 49, Volume 5]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR393.78]



[Page 424-425]

 

                        TITLE 49--TRANSPORTATION

 

                      DEPARTMENT OF TRANSPORTATION

 

PART 393_PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of 

Contents

 

              Subpart G_Miscellaneous Parts and Accessories

 

Sec. 393.78  Windshield wiping and washing systems.



    (a) Vehicles manufactured on or after December 25, 1968. Each bus, 

truck, and truck-tractor manufactured on or after December 25, 1968, 

must have a windshield wiping system that meets the requirements of 

FMVSS No. 104 (S4.1) in effect on the date of manufacture. Each of these 

vehicles must have a windshield washing system that meets the 

requirements of FMVSS No. 104 (S4.2.2) in effect on the date of 

manufacture.

    (b) Vehicles manufactured between June 30, 1953, and December 24, 

1968. Each truck, truck-tractor, and bus manufactured between June 30, 

1953, and December 24, 1968, shall be equipped with a power-driven 

windshield wiping system with at least two wiper blades, one on each 

side of the centerline of the windshield. Motor vehicles which depend 

upon vacuum to operate the windshield wipers, shall have the wiper 

system constructed and maintained such that the performance of the 

wipers will not be adversely affected by a change in the intake manifold 

pressure.

    (c) Driveaway-towaway operations. Windshield wiping and washing 

systems need not be in working condition while a commercial motor 

vehicle is



[[Page 425]]



being towed in a driveaway-towaway operation.



[70 FR 48054, Aug. 15, 2005]