research.
well, not exactly. =) By the California DMV books, it is true.
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26708. (a) (1) No person shall drive any motor vehicle with any
object or material placed, displayed, installed, affixed, or applied
upon the windshield or side or rear windows.
(2) No person shall drive any motor vehicle with any object or
material placed, displayed, installed, affixed, or applied in or upon
the vehicle which obstructs or reduces the driver's clear view
through the windshield or side windows.
(3) This subdivision applies to a person driving a motor vehicle
with the driver's clear vision through the windshield, or side or
rear windows, obstructed by snow or ice.
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now technically, lettering in the top few inches doesn't obstruct your view, unless you're freakishly big and unless the police count the view of lil birdies.
However, among the listed exceptions, is,
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(c) Notwithstanding subdivision (a), transparent material may be
installed, affixed, or applied to the topmost portion of the
windshield if the following conditions apply:
(1) The bottom edge of the material is at least 29 inches above
the undepressed driver's seat when measured from a point 5 inches in
front of the bottom of the backrest with the driver's seat in its
rearmost and lowermost position with the vehicle on a level surface.
(2) The material is not red or amber in color.
(3) There is no opaque lettering on the material and any other
lettering does not affect primary colors or distort vision through
the windshield.
(4) The material does not reflect sunlight or headlight glare into
the eyes of occupants of oncoming or following vehicles to any
greater extent than the windshield without the material.
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Now this more applies to sunshade material, but can definitely be bent to apply to other things. my lettering isn't opaque.. it's just nearly opaque.
I'm sure I'm missing something, too.
either way, don't worry too much bout it.