Fog Lamps Only -- Against the Law?
In Nevada, the Fog Lamp law reads as follows:
NRS 484.577...Any motor vehicle may be equipped with not to exceed two fog lamps...so aimed that when the vehicle is not loaded none of the high-intensity portion of the light to the left of center of the vehicle shall at a distance of 25 feet ahead project higher than a level of 4 inches below the level of the center of the lamp from which it comes. Such lighted fog lamps may be used with lower head lamp beams as provided in NRS 484.587.
The kicker is this:
NRS 484.587 Equipment for lighting road with multiple beams...There shall be an uppermost distribution of light, or composite beam, so aimed and of such intensity to reveal persons and vehicles at a distance of at least 350 feet ahead...
The law limits the projection of light from Fog Lamps, but requires sufficient light to illuminate 350 feet ahead; therefore, Fog Lamps alone do not meet the requirements...
I'm sure other States' laws are similar.