KKK-B-1579B
3.4.2.5.1 Exterior lighting. All exterior lights on the vehicle shall conform to Federal
Motor Vehicle Safety Standard No. 108. Electrical system voltage shall be 12 volts. When
specified (see 6.2), left dip headlights, as used on right hand drive vehicles, shall be furnished
and shall be adjusted for driving on left side of road prior to shipment. Turn signals shall be of
the self-canceling type.
3.4.2.5.2 Interior lighting. Interior lighting shall include, 15-candle power domelights,
of grade and quality not less than 12 square inches (in2) of polished, reflecting surface fitted with
frosted translucent lens providing not less than 30 square inches area. Domelights shall be
installed over each row of passenger seats, placed over the first or second seat from the front and
thereafter over each second seat. One domelight shall be installed over the driver area and
controlled with a separate switch. Door-operated step lamp(s) shall be furnished and installed to
provide illumination of stepwell and ground adjacent to steps. An emergency door identification
red light with not less than a 3-inch diameter lens shall be provided in accordance with Federal
Motor Carrier Safety Regulation 393.92 (see 3.5.5.2).
3.4.2.6 Passenger signal buzzer. When specified (see 6.2), manufacturer's standard
passenger signal buzzer equipment shall be furnished, operated by suitable pull cords on both
sides of bus, and provided with a driver's cutout switch.
3.4.2.7 Horn. An electric horn, suitable for bus service, shall be provided.
3.4.2.8 School bus red signal lamps. Type V, VI, and VII buses, and other types of
buses when specified (see 6.2), shall be equipped with four red signal lamps conforming to
Federal Motor Vehicle Safety Standard No. 108.
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3.4.3 Fuel system. The fuel system shall conform to Federal Motor Carrier Safety
Regulations 393.65 and 393.67.
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3.4.3.1 Air cleaner. A dry type air cleaner shall be furnished. The air cleaner shall
include an indicator or light mounted on the dash or adjacent to the air cleaner, to indicate when
filter should be changed.
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3.4.3.2 Fuel tank(s). Safety fuel tank(s) conforming to Federal Motor Carrier Safety
Regulations 393.65 and 393.67 shall be furnished. Total capacity of the fuel tank(s) for vehicles
with and without air conditioning shall be not less than that specified in Table III. When
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