49 C.F.R. § 571.201
Current through September 30, 2024
A-pillar means any pillar that is entirely forward of a transverse vertical plane passing through the seating reference point of the driver's designated seating position or, if there is no driver's designated seating position, any pillar that is entirely forward of a transverse vertical plane passing through the seating reference point of the rearmost designated seating position in the front row of seats.
Ambulance means a motor vehicle designed exclusively for the purpose of emergency medical care, as evidenced by the presence of a passenger compartment to accommodate emergency medical personnel, one or more patients on litters or cots, and equipment and supplies for emergency care at a location or during transport.
B-pillar means the forwardmost pillar on each side of the vehicle that is, in whole or in part, rearward of a transverse vertical plane passing through the seating reference point of the driver's designated seating position or, if there is no driver's designated seating position, the forwardmost pillar on each side of the vehicle that is, in whole or in part, rearward of a transverse vertical plane passing through the seating reference point of the rearmost designated seating position in the front row of seats, unless:
Brace means a fixed diagonal structural member in an open body vehicle that is used to brace the roll-bar and that connects the roll-bar to the main body of the vehicle structure.
Convertible means a vehicle whose A-pillars are not joined with the B-pillars (or rearmost pillars) by a fixed, rigid structural member.
Convertible roof frame means the frame of a convertible roof.
Convertible roof linkage mechanism means any anchorage, fastener, or device necessary to deploy a convertible roof frame.
Daylight opening means, for openings on the side of the vehicle, other than a door opening, the locus of all points where a horizontal line, perpendicular to the vehicle longitudinal centerline, is tangent to the periphery of the opening. For openings on the front and rear of the vehicle, other than a door opening, daylight opening means the locus of all points where a horizontal line, parallel to the vehicle longitudinal centerline, is tangent to the periphery of the opening. If the horizontal line is tangent to the periphery at more than one point at any location, the most inboard point is used to determine the daylight opening.
Door frame means the rearmost perimeter structure, including trim but excluding glass, of the forward door and the forwardmost perimeter structure, including trim but excluding glass, of the rear door of a pair of adjacent side doors that:
Door opening means, for door openings on the side of the vehicle, the locus of all points where a horizontal line, perpendicular to the vehicle longitudinal centerline, is tangent to the periphery of the side door opening. For door openings on the back end of the vehicle, door opening means the locus of all points where a horizontal line, parallel to the vehicle longitudinal centerline, is tangent to the periphery of the back door opening. If the horizontal line is tangent to the periphery at more than one point at any location, the most inboard point is the door opening.
Dynamically deployed upper interior head protection system means a protective device or devices which are integrated into a vehicle and which, when activated by an impact, provide, through means requiring no action from occupants, protection against head impacts with upper interior structures and components of the vehicle in crashes.
Forehead impact zone means the part of the free motion headform surface area that is determined in accordance with the procedure set forth in S8.10.
Free motion headform means a test device which conforms to the specifications of part 572, subpart L of this chapter.
Interior rear quarter panel means a vehicle interior component located between the rear edge of the side door frame, the front edge of the rearmost seat back, and the daylight opening.
Mid-sagittal plane of a dummy means a longitudinal vertical plane passing through the seating reference point of a designated seating position.
Other door frame means the rearmost perimeter structure, including trim but excluding glass, of the forward door and the forwardmost perimeter structure, including trim but excluding glass, of the rear door of a pair of adjacent side doors that:
Other pillar means any pillar which is not an A-pillar, a B-pillar, or a rearmost pillar.
Pillar means any structure, excluding glazing and the vertical portion of door window frames, but including accompanying moldings, attached components such as safety belt anchorages and coat hooks, which:
Roll-bar means a fixed overhead structural member, including its vertical support structure, that extends from the left to the right side of the passenger compartment of any open body vehicles and convertibles. It does not include a header.
Seat belt anchorage means any component involved in transferring seat belt loads to the vehicle structure, including, but not limited to, the attachment hardware, but excluding webbing or straps, seat frames, seat pedestals, and the vehicle structure itself, whose failure causes separation of the belt from the vehicle structure.
Seat belt mounting structure means:
Sliding door track means a track structure along the upper edge of a side door opening that secures the door in the closed position and guides the door when moving to and from the open position.
Stiffener means a fixed overhead structural member that connects one roll-bar to another roll-bar or to a header of any open body vehicle or convertible.
Upper roof means the area of the vehicle interior that is determined in accordance with the procedure set forth in S8.15.
Windshield trim means molding of any material between the windshield glazing and the exterior roof surface, including material that covers a part of either the windshield glazing or exterior roof surface.
Where the term a is the resultant head acceleration expressed as a multiple of g (the acceleration of gravity), and t1 and t2 are any two points in time during the impact which are separated by not more than a 36 millisecond time interval.
Table 1-Approach Angle Limits (in Degrees)
| Target component | Horizontal Angle | Vertical angle |
| Front Header | 180 | 0-50 |
| Rear Header | 0 or 360 | 0-50 |
| Left Side Rail | 270 | 0-50 |
| Right Side Rail | 90 | 0-50 |
| Left Sliding Door Track | 270 | 0-50 |
| Right Sliding Door Track | 90 | 0-50 |
| Left A-Pillar | 195-255 | -5-50 |
| Right A-Pillar | 105-165 | -5-50 |
| Left B-Pillar | 195-345 | -10-50 |
| Right B-Pillar | 15-165 | -10-50 |
| Left Door Frame | 195-345 | -10-50 |
| Right Door Frame | 15-165 | -10-50 |
| Other Left Pillars | 270 | -10-50 |
| Other Right Pillars | 90 | -10-50 |
| Other Left Door Frame | 270 | -10-50 |
| Other Right Door Frame | 90 | -10-50 |
| Left Rearmost Pillar | 270-345 | -10-50 |
| Right Rearmost Pillar | 15-90 | -10-50 |
| Upper Roof | Any | 0-50 |
| Overhead Rollbar | 0 or 180 | 0-50 |
| Brace or Stiffener | 90 or 270 | 0-50 |
| Left Seat Belt Mounting Structure | 195-345 | -10-50 |
| Right Seat Belt Mounting Structure | 15-165 | -10-50 |
| Seat Belt Anchorages | Any | 0-50 |
49 C.F.R. §571.201
For FEDERAL REGISTER citations affecting § 571.201, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.