Curtains shall be permitted on any window other than the windshield and windows to the right and left of the driver, as long as the vehicle is equipped with outside mirrors on the left and the right side of the driver, which affords a clear view of the road to the rear of the vehicle.
N.H. Admin. Code § Saf-C 3217.08
(See Revision Notes at chapter heading Saf-C 3200) #8915, eff 6-22-07