Appendix D to Part 658 - Devices That Are Excluded From Measurement of the Length or Width of a Commercial Motor Vehicle
23:1.0.1.7.35.0.1.14.30 : Appendix D
Appendix D to Part 658 - Devices That Are Excluded From Measurement
of the Length or Width of a Commercial Motor Vehicle
The following devices are excluded from measurement of the
length or width of a commercial motor vehicle, as long as they do
not carry property and do not exceed the dimensional limitations
included in § 658.16. This list is not exhaustive.
1. All devices at the front of a semitrailer or trailer
including, but not limited to, the following:
(a) A device at the front of a trailer chassis to secure
containers and prevent movement in transit;
(b) A front coupler device on a semitrailer or trailer used in
road and rail intermodal operations;
(c) Aerodynamic devices, air deflector;
(d) Air compressor;
(e) Certificate holder (manifest box);
(f) Door vent hardware;
(g) Electrical connector;
(h) Gladhand;
(i) Handhold;
(j) Hazardous materials placards and holders;
(k) Heater;
(l) Ladder;
(m) Non-load carrying tie-down devices on automobile
transporters;
(n) Pickup plate lip;
(o) Pump offline on tank trailer;
(p) Refrigeration unit;
(q) Removable bulkhead;
(r) Removable stakes;
(s) Stabilizing jack (anti-nosedive device);
(t) Stake pockets;
(u) Step;
(v) Tarp basket;
(w) Tire carrier; and
(x) Uppercoupler.
2. Devices excluded from length measurement at the rear of a
semitrailer or trailer including, but not limited to, the
following:
(a) Handhold;
(b) Hazardous materials placards and holders;
(c) Ladder;
(d) Pintle hook;
(e) Removable stakes;
(f) Splash and spray suppression device;
(g) Stake pockets; and
(h) Step.
3. Devices excluded from width determination, not to exceed 3
inches from the side of the vehicle including, but not limited to,
the following:
(a) Corner caps;
(b) Hazardous materials placards and holders;
(c) Lift pads for trailer on flatcar (piggyback) operation;
(d) Rain gutters;
(e) Rear and side door hinges and their protective hardware;
(f) Side marker lamps;
(g) Structural reinforcement for side doors or intermodal
operation (limited to 1 inch from the side within the 3 inch
maximum extension);
(h) Tarping systems for open-top trailers;
(i) Movable devices to enclose the cargo area of flatbed
semitrailers or trailers, usually called tarping systems, where no
component part of the system extends more than 3 inches from the
sides or back of the vehicle when the vehicle is in operation. This
exclusion applies to all component parts of tarping systems,
including the transverse structure at the front of the vehicle to
which the sliding walls and roof of the tarp mechanism are
attached, provided the structure is not also intended or designed
to comply with 49 CFR 393.106, which requires a headerboard strong
enough to prevent cargo from penetrating or crushing the cab; the
transverse structure may be up to 108 inches wide if properly
centered so that neither side extends more than 3 inches beyond the
structural edge of the vehicle. Also excluded from measurement are
side rails running the length of the vehicle and rear doors,
provided the only function of the latter, like that of the
transverse structure at the front of the vehicle, is to seal the
cargo area and anchor the sliding walls and roof. On the other
hand, a headerboard designed to comply with 49 CFR 393.106 is load
bearing and thus limited to 102 inches in width. However, the
“wings” designed to close the gap between such a headerboard and
the movable walls and roof of a tarping system are width exclusive,
provided they are add-on pieces designed to bear only the load of
the tarping system itself and are not integral parts of the
load-bearing headerboard structure;
(j) Tie-down assembly on platform trailers;
(k) Wall variation from true flat; and
(l) Weevil pins and sockets on low-bed trailers.
[67 FR 15110, Mar. 29, 2002]