http://edocket.access.gpo.gov/cfr_20...cfr571.108.pdf
Page 71/73 (of the PDF - 306 of the actual document) states the requirement of a third, red identification light mounted as high as feasible on the rear of the vehicle. Apparently it is not required to have a brake light function, mearly a running light function.
But the third light must be there.
- X
P.S. - However, in vehicles where one brake light serves as a turn signal, it MUST be a brake light in order to fulfill the 2 stop lamps requirement.
P.P.S. - it has been brought to my attention that most CHMSLs don't have a running light function - for this I have no explanation. I can merely state that I am NOT a lawyer, and not qualified to interpret any laws. But... theres the full text if you want to read through all of it.
P.P.P.S. - FOUND IT!
Quote:
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S5.1.1.27 (a) Except as provided in
paragraph (b) of this section, each passenger
car manufactured on or after
September 1, 1985, and each multipurpose
passenger vehicle, truck, and bus,
whose overall width is less than 80
inches, whose GVWR is 10,000 pounds or
less, manufactured on or after September
1, 1993, shall be equipped with a
high-mounted stop lamp which:
(1) Shall have an effective projected luminous area not less than 4
1⁄2 square inches.
(2) Shall have a signal visible to the
rear through a horizontal angle from 45
degrees to the left to 45 degrees to the
right of the longitudinal axis of the vehicle.
(3) Shall have the minimum photometric
values in the amount and location
listed in Figure 10.
(4) Need not meet the requirements
of paragraphs 3.1.6 Moisture Test, 3.1.7
Dust Test, and 3.1.8 Corrosion Test of
SAE Recommended Practice J186a,
Supplemental High-Mounted Stop and
Rear Turn Signal Lamps, September
1977, if it is mounted inside the vehicle.
(5) Shall provide access for convenient
replacement of the bulb without
the use of special tools.
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