purpose of roof lights?
Why do 3/4 and above pickups have a row of lights on the roof, but not the 1/2 ton? What purpose do the lights serve, other than working-man's "bling"?
Forum Discussion
Whitenight wrote:
I think its so at night oncoming and following traffic will know that the vehicle is wider (80" wide or more).
Yep on the 80" and wider needing to have the outer marker lights plus the center ID marker lamps.
FMVSS 108 and CMVSS 108 cover lighting.
Here's where you can read all about it: http://www.gpo.gov/fdsys/pkg/CFR-2011-title49-vol6/pdf/CFR-2011-title49-vol6-sec571-108.pdf
If you like pictures, read this: http://www.nhtsa.gov/cars/rules/standards/conspicuity/TBMpstr.html
In summary: "To Indicate the presence of a wide vehicle"
(read #3 and #7)
Here's #3:
Front Identification Lamps (ID) (P2 or P3) Indicate presence of a wide vehicle
#7 deals with the rear lights.
Wide is defined as over 80"
