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Cab Lamps

If this is what you are asking about.

The three in the center are required by the Interstate Commerce Commission on any thing more than 96" wide. The outer tow ore clearance lights.

Frank
 
Once there was a car hauler(portable parking lot) whose headlights quit on his truck. He had a car loaded overhead the cab facing forward. So he
turned on the headlights on the car. He thought
that this would get him to the next town where he could get his lights fixed. He was going real slow
and careful like. A car coming the other way got close to him and then drove into the ditch. So he
stopped and asked why he drove into the ditch.
HE SAID " I was afraid you were as wide as you were high".
 
Almost right. The 3 cluster indicates over 80 inches wide. Cab corners show widest point.
ICC was abolished somewhere around 1995, duties taken over by Dept of Transp.
WJ
 
Back Forty Bob, sounds like you been listening to Justin Wilson records.
On the Dave Nemo all night radio show years ago he wood play some of Justins records and that wuz one of them.
 
On some smaller trucks (non-semi) I've seen only one or two lights in the center, any reasoning behind this?
 
off and gone has it correct,cab lite do indeed serve a purpose,and are required by federal law on large trucks, the spacing of the lites on a large truck tells you what you need to know, if you look, pickups with factory cab lite are evenly spaced across the roof of the truck, simply for looks, some aftermarket cab lites installed by owners or shops will sometimes be installed in the commercial 3 in the middle 1 on each side configuration, but the height of the lites above the ground tells you its not a big rig
 
(quoted from post at 07:49:49 03/23/13) off and gone has it correct,cab lite do indeed serve a purpose,and are required by federal law on large trucks, the spacing of the lites on a large truck tells you what you need to know, if you look, pickups with factory cab lite are evenly spaced across the roof of the truck, simply for looks, some aftermarket cab lites installed by owners or shops will sometimes be installed in the commercial 3 in the middle 1 on each side configuration, but the height of the lites above the ground tells you its not a big rig
Click to expand...

Some pick-ups have them evenly spaced but many have them 3+2. Almost all one tons come with them from the factory because of the likelihood of the pick-up being used as a tractor to pull a heavy enough trailer to come under the commercial truck laws. CFR 393.11
 
They are required on anything over a certain width. Optional on anything narrower. Dual-wheel pick-ups require them due to their width, and come with the tow package on single-wheel trucks due to trailer widths.

Same with the cluster light in back. If it's over that width, you need 3 lights in a horizontal line in the center.
 
Aside from identifying big trucks, there's a couple other reasons. I ordered my F-250 with them because-as someone mentioned below-they just look cool. But the other reason, I don't know why, but some drivers can't see those 2 big white lights but notice 5 smaller yellow lights. Go figure.
 
All the basic lights, reflective tape, reflectors, etc are outlined in the FMSCR. Additional lighting that makes the rig look like the mother ship from "Close Encounters"...that's vanity and up to the owner.
 
The local constabulary hasn"t had any issue with these... yet. Can"t find a decent new socket to replace the stock socket that was ruined by the junk signal lenses I have been able to find.

These have been upgraded to LEDs.
030412132752_01.jpg
 
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