Here's what Nevada requires (note that this is from the DMV in Las Vegas):

First off, the state requires that a state certified mechanic inspect the brakes and steering and sign off on the inspection form available at any

Nevada DMV. Once that is done, you can take your bike to a DMV office with an inspection office and they will check for the following:

Headlight;
the bonus is that in Nevada that there is no requirement that it be hi/lo beam

Tail Lamp;
must be red and visible from 500 feet

Stop Lamp;
unfortunately, a switch for each of the front & back brake lever/pedal so that either/both will activate the light

Turn Signals (front & rear);
must be "as widely spaced as practicable"

Horn;
must be audible from 200 feet

Mirrors;
need both a left and right and each must be at least 3" in diameter and mounted to the handlebars

Muffler;
"must be in good working condition"

Fenders; duh

Reflector (rear);
must be visible - doesn't specify a size

Brakes;
has to have both front and rear - duh again

Thanks to
Jason in Las Vegas, NV
For the info