[Code of Federal Regulations]
[Title 49, Volume 5]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR393.61]

[Page 411-412]
 
                        TITLE 49--TRANSPORTATION
 
                      DEPARTMENT OF TRANSPORTATION
 
PART 393_PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of 
Contents
 
                Subpart D_Glazing and Window Construction
 
Sec.  393.61  Truck and truck tractor window construction.

    Each truck and truck tractor (except trucks engaged in armored car 
service) shall have at least one window on each side of the driver's 
compartment. Each window must have a minimum area of

[[Page 412]]

1,290 cm\2\ (200 in\2\) formed by a rectangle 33 cm by 45 cm (13 inches 
by 17\3/4\ inches). The maximum radius of the corner arcs shall not 
exceed 152 mm (6 inches). The long axis of the rectangle shall not make 
an angle of more than 45 degrees with the surface on which the unladen 
vehicle stands. If the cab is designed with a folding door or doors or 
with clear openings where doors or windows are customarily located, no 
windows shall be required in those locations.

[70 FR 48052, Aug. 15, 2005]