On Wed, 4 Jan 2006, Ed White wrote:

> Is it legal to use the "Nite Shades" on taillight lens? This product
> darkens the lens.

Application of a tinted coating or any kind of covering, even a clear one,
over a lighting device is prohibited by Federal Motor Vehicle Safety
Standard 108 (Lamps and Reflective Devices). Therefore, in every state it
is Federally illegal for any party except the vehicle owner to apply such
a covering or coating. In a state with a vehicle code that incorporates
FMVSS 108 requirements, either by incorporation or by reference,
application of a lens-darkening coating by any party including the vehicle
owner would be illegal. Even in states that do not incorporate or
reference FMVSS 108 requirements in their vehicle codes, it is very likely
that application of any tinted coating or covering would render the
vehicle noncompliant with state requirements for lighting device
visibility and/or performance.

And, finally, even if you live in a state with a vehicle code that is
completely silent on the matter, application of any tinted or opaque
coating or covering to any vehicle lighting or reflective device is a
collossally stupid idea. Not only does it sharply reduce the performance
of these safety devices, increasing the likelihood you'll be hit, but it
also is an open invitation for cops to pay special attention to you. Ever
drive out of state, or even to the next town? Just because local cops
don't care doesn't mean other cops will likewise disregard the
modification. And, in the event of a collision, it would be a rather easy
case to make in court that the coating or covering on a vehicle's lamps
reduced their performance to such a degree that they were a causal factor
in the crash.

DS