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C.F.R - Table of Contents

  • Title 1 - General Provisions
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  • Title 49 - Transportation
  • Title 50 - Wildlife and Fisheries

CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER III—FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 300–399) > SUBCHAPTER B—FEDERAL MOTOR CARRIER SAFETY REGULATIONS (Parts 350–399) > PART 393—PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION > SUBPART B—Lamps, Reflective Devices, and Electrical Wiring (§393.9 to §393.31-393.33) > 393.22—Combination of lighting devices and reflectors.

393.22—Combination of lighting devices and reflectors.

(a) Permitted combinations. Except as provided in paragraph (b) of this section, two or more lighting devices and reflectors (whether or not required by the rules in this part) may be combined optically if—
(1) Each required lighting device and reflector conforms to the applicable rules in this part; and
(2) Neither the mounting nor the use of a nonrequired lighting device or reflector impairs the effectiveness of a required lighting device or reflector or causes that device or reflector to be inconsistent with the applicable rules in this part.
(b) Prohibited combinations. (1) A turn signal lamp must not be combined optically with either a head lamp or other lighting device or combination of lighting devices that produces a greater intensity of light than the turn signal lamp.
(2) A turn signal lamp must not be combined optically with a stop lamp unless the stop lamp function is always deactivated when the turn signal function is activated.
(3) A clearance lamp must not be combined optically with a tail lamp or identification lamp.
[39 FR 26908, July 24, 1974]




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