Re: Is it OK to put yellow marker lights...
From the Transportation Safety page, this one happens to be from Oregon but the law is the same everywhere. Here is the link also.
http://www.oregon.gov/ODOT/TS/Veh_Equipment.shtml
TRAILERS
1) Do trailers need lights if you can see the lights of the tow vehicle past the trailer?
Answer: Yes
. All trailers regardless of size need to be equipped with the following lights:
- Two red tail lights;
- Two red stop (brake) lights;
- Two red or amber turn signal lights;
- Two red reflex reflectors (a reflex reflector is a reflector that is incorporated into the lens of the light, not a piece of reflective tape)
All of the above lights may be incorporated into one light assembly on each side of the rear of the trailer. The lights should be mounted as far as practical to the outside edge of the trailer and as far as practical to the rear of the trailer.
- Side marker lights and side reflex reflectors.
The side marker lights and reflex reflectors on the rear side must be red and can be incorporated in the tail light assembly above if they are visible from the side of the trailer. The side marker lights and reflex reflectors on the front side must be amber and as close to the front as practical.
(ORS 816.320)
Trailers that are over 80 inches wide or longer than 30 feet or that have a GVWR of 10,000 lbs. or more; have more light and reflector requirements. See the following DOT site for that information as well as location for all of the above lights:
http://www.nhtsa.dot.gov/cars/rules/standards/conspicuity/Trlrpstr.html
Trailers that weigh 1,800 pounds or more loaded, need to be registered and licensed through Oregon Motor Vehicles Division.
