If anyone is tired and can't get to sleep here is the law on reflectors on vehicles in the U.S. I'm no law professor but the way I read it is "don't touch the reflectors surrounding the head or tail lights".
Enjoy:
§ 393.26 Requirements for reflectors.
(a)Mounting.
Reflex reflectors shall be mounted at the locations required by
§ 393.11. In the case of
motor vehicles so constructed that requirement for a 381 mm (15-inch) minimum height above the road surface is not practical, the reflectors shall be mounted as close as practicable to the required mounting height range. All permanent
reflex reflectors shall be securely mounted on a rigid part of the vehicle. Temporary reflectors on projecting loads must be securely mounted to the load and are not required to be permanently mounted to a part of the vehicle. Temporary
reflex reflectors on
vehicles transported in
driveaway-towaway operations must be firmly attached.
(b)Specifications. All required
reflex reflectors (except
reflex reflectors on projecting loads,
vehicles transported in a
driveaway-towaway operation, converter dollies and pole trailers) on
vehiclesmanufactured on or after December 25, 1968, shall meet the applicable requirements of FMVSS No. 108 in effect on the date of manufacture of the vehicle.
Reflex reflectors on projecting loads,
vehicles transported in a
driveaway-towaway operation, and all
reflex reflectorson converter dollies and
pole trailers must conform to SAE J594 - Reflex Reflectors, December 2003.
(c)Substitute material for side reflex reflectors.
Reflective material conforming to ASTM D 4956-04, Standard Specification for Retroreflective Sheeting for Traffic Control, may be used in lieu of
reflex reflectors if the material as used on the vehicle, meets the performance standards in either Table I of SAE J594 or Table IA of SAE J594 -
Reflex Reflectors, December 2003. (See
§ 393.7(b) for information on the incorporation by reference and availability of these documents.)
(d)Use of additional retroreflective surfaces. Additional retroreflective surfaces may be used in conjunction with, but not in lieu of the
reflex reflectors required in subpart B of part 393, and the substitute material for side
reflex reflectors allowed by
paragraph (c) of this section, provided:
(1) Designs do not resemble traffic control signs, lights, or devices, except that straight edge striping resembling a barricade pattern may be used.
(2) Designs do not tend to distort the length and/or width of the
motor vehicle.
(3) Such surfaces shall be at least 3 inches from any required
lamp or reflector unless of the same color as such
lamp or reflector.
(4) No red color shall be used on the front of any
motor vehicle, except for display of markings or placards required by
§ 177.823 of this title.
(5) Retroreflective license plates required by
State or local authorities may be used.
[
33 FR 19735, Dec. 25, 1968, as amended at
35 FR 3167, Feb. 19, 1970;
53 FR 49397, Dec. 7, 1988;
70 FR 48047, Aug. 15, 2005]