Sec. 393.106 Front-end structure.
(a) General rule.
(1) Except as provided in paragraph (g) of this
section, every cargo-carrying motor vehicle must be equipped with a
headerboard or similar device of sufficient strength to prevent load
shifting and penetration or crushing of the driver's compartment.
(2) On and after the effective dates specified in paragraph (h) of
this section, every cargo-carrying motor vehicle must have a front-end
structure that conforms to the rules in this section.
(b) Location.
The front-end structure must be located between the
vehicle's cargo and the vehicle's driver.
(c) Height and width. The front-end structure must extend either to
a height of 4 feet above the floor of the vehicle or to a height at
which it blocks forward movement of any item of cargo being carried on
the vehicle, whichever is lower. The front-end structure must have a
width which is at least equal to the width of the vehicle or which
blocks forward movement of any item of cargo being transported on the
vehicle, whichever is narrower.
(d) Strength. The front-end structure must be capable of
withstanding the horizontal forward static load specified in either
paragraph (d) (1) or (2) of this section.
(1) For a front-end structure less than 6 feet in height, a
horizontal forward static load equal to one half (\1/2\) of the weight
of the cargo being transported on the vehicle uniformly distributed over
the entire portion of the front-end structure that is within 4 feet
above the vehicle's floor or that is at or below a height above the
vehicle's floor at which it blocks forward movement of any item of the
vehicle's cargo, whichever is less.
(2) For a front-end structure 6 feet in height or higher, a
horizontal forward static load equal to four-tenths (0.4) of the weight
of the cargo being transported on the vehicle uniformly distributed over
the entire front-end structure.
(e) Penetration resistance. The front-end structure must be
designed, constructed and maintained so that it is capable of resisting
penetration by any item of cargo that contacts it when the vehicle
decelerates at a rate of 20 feet per second per second. The front-end
structure must have no aperture large enough to permit any item of cargo in contact with the structure to pass through it.
(f) Substitute devices. The requirements of this section may be met
by the use of devices performing the same functions as a front-end
structure, if the devices are at least as strong as, and provide
protection against shifting cargo at least equal to, a front-end
structure which conforms to those requirements.
(g) Exemptions. The following motor vehicles are exempt from the
rules in this section:
(1) A vehicle which is designed and used exclusively to transport
other vehicles, if each vehicle it transports is securely tied down by
devices that conform to the requirements of Sec. 393.102.
(2) A pole trailer or semitrailer being towed by a truck tractor
that is equipped with a front-end structure that conforms to the rules
in this section.
(3) A full trailer being towed by a vehicle that is equipped with a
front-end structure that conforms to the requirements of this section
for a front-end structure.
(4) A full trailer being towed by a vehicle that is loaded in such a
manner that the cargo on the towing vehicle conforms to the requirements of this section for a front-end structure.
(5) The rules in paragraphs (d) and (e) of this section do not apply
to a motor vehicle manufactured before January 1, 1974.
(h) Effective dates. Cargo-carrying motor vehicles which are not
exempted by paragraph (g) of this section must conform to the rules in
this section as follows:
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It must conform to
If the vehicle was manufactured-- the rules in On and after--
paragraph--
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Before Jan. 1, 1974............. (a), (b), and (f). October 1, 1973 or
the date it was
manu- factured,
whichever is
later.
Before Jan. 1, 1974............. (c)............... January 1, 1975.
On or after Jan. 1, 1974........ (a) through (f) The date it was
inclusive. manufactured.
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Paragraphs (d) and (e) of this section do not apply to a motor vehicle
that was manufactured before January 1, 1974.