§ 393.78 Windshield wiping and washing systems.
Current wording, in the annual edition revised as of Oct. 1, 2005.
(a) EveryVehicles bus,manufactured truck,on andor truckafter tractorDecember 25, having1968. aEach windshieldbus, shalltruck, beand equippedtruck-tractor withmanufactured aton leastor twoafter automatically-operatingDecember windshield25, wiper blades1968, onemust onhave eacha sidewindshield ofwiping thesystem centerlinethat ofmeets the windshield,requirements forof cleaningFMVSS rain,No. snow,104 or(S4.1) otherin moistureeffect fromon the windshielddate andof whichmanufacture. shallEach beof inthese suchvehicles conditionmust ashave toa providewindshield clearwashing visionsystem forthat meets the driver,requirements unlessof oneFMVSS suchNo. blade104 be(S4.2.2) soin arrangedeffect ason tothe cleandate an area of themanufacture.
(b) windshieldVehicles extendingmanufactured tobetween withinJune 130, inch1953, ofand theDecember limit24, of1968. visionEach throughtruck, thetruck-tractor, windshieldand atbus eachmanufactured side:between ProvidedJune 30, however1953, Thatand inDecember driveaway-towaway24, operations1968, this section shall applybe onlyequipped towith thea power-driven vehicle:windshield Andwiping providedsystem further,with Thatat oneleast windshieldtwo wiper bladeblades, willone sufficeon undereach thisside sectionof whenthe suchcenterline drivenof vehiclethe inwindshield. driveaway-towawayMotor operationvehicles constituteswhich partdepend orupon allvacuum ofto operate the propertywindshield beingwipers, transportedshall andhave hasthe nowiper provisionsystem forconstructed twoand maintained such blades.that
(b)Everythe bus,performance truck,of andthe truckwipers tractor,will thenot datebe ofadversely manufactureaffected ofby whicha ischange subsequentin tothe Juneintake 30,manifold 1953,pressure.
(c) whichDriveaway-towaway dependsoperations. uponWindshield vacuumwiping toand operatewashing thesystems windshieldneed wipers,not shall be soin constructedworking thatcondition thewhile operationa ofcommercial themotor wipersvehicle willis notbeing betowed materiallyin impaireda bydriveaway-towaway changeoperation.
[70 inFR the48054, intakeAug. manifold15, pressure.2005]
(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 being towed in a driveaway-towaway operation.
[70 FR 48054, Aug. 15, 2005]
Amendment history
2 distinct wordings on file since Oct. 1, 1996- [70 FR 48054, Aug. 15, 2005]
- Oct. 1, 1996 → Oct. 1, 2005annual editions 1996–2004
A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section. Set a case date in the header to read any earlier wording.