Purpose and Scope. This standard establishes requirements for ejection mitigation systems to reduce the likelihood of complete and partial ejections of vehicle occupants through side windows during rollovers or side impact events. This standard applies to passenger cars, and to multipurpose passenger vehicles , trucks and buses with a gross vehicle weight rating of 4, kg or less, except walk-in vans, modified roof vehicles and convertibles. Also excluded from this standard are law enforcement vehicles , correctional institution vehicles , taxis and limousines, if they have a fixed security partition separating the 1st and 2nd or 2nd and 3rd rows and if they are produced by more than one manufacturer or are altered within the meaning of 49 CFR

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This standard specifies requirements for rear impact guards for trailers and semi trailers. The purpose of this standard is to reduce the number of deaths and serious injuries that occur when light duty vehicles collide with the rear end of trailers and semi trailers.

This standard applies to rear impact guards for trailers and semitrailers subject to Federal Motor Safety Standard No. In this standard, directional terms such as bottom, center, height, horizontal, longitudinal, transverse, and rear refer to directions relative to the vehicle orientation when the guard is oriented as if it were installed on a vehicle according to the installation instructions in S5.

Chassis means the load supporting frame structure of a motor vehicle. Guard width means the maximum horizontal guard dimension that is perpendicular to the longitudinal vertical plane passing through the longitudinal centerline of the vehicle when the guard is installed on the vehicle according to the installation instructions in S5. Horizontal member means the structural member of the guard that meets the configuration requirements of S5.

Hydraulic guard means a guard designed to use fluid properties to provide resistance force to deformation. Rigid test fixture means a supporting structure on which a rear impact guard can be mounted in the same manner it is mounted to a vehicle. The rigid test fixture is designed to resist the forces applied to the rear impact guard without significant deformation, such that a performance requirement of this standard must be met no matter how small an amount of energy is absorbed by the rigid test fixture.

The horizontal member of each guard, when viewed from the rear as it would be installed on a trailer pursuant to the installation instructions or procedures required by S5. See Figure 1 of this section. When tested under the procedures of S6 of this section, each guard shall comply with the strength requirements of S5.

However, a particular guard i. The guard must resist the force levels specified in S5. A guard, other than a hydraulic guard , shall absorb by plastic deformation within the first mm of deflection at least 5, J of energy at each test location P3.

See Figure 2 of this section. Each guard shall be permanently labeled with the information specified in S5. The information shall be in English and in letters that are at least 2. The label shall be placed on the forward or rearward facing surface of the horizontal member of the guard, provided that the label does not interfere with the retroreflective sheeting required by S5.

Each guard, other than a guard that is to be installed on a vehicle manufactured by the manufacturer of the guard, shall be accompanied by all attachment hardware necessary for installation of the guard on the chassis of the motor vehicle for which it is intended.

The manufacturer of rear impact guards for sale to vehicle manufacturers shall include with each guard printed instructions in English for installing the guard, as well as a diagram or schematic depicting proper guard installation.

The instructions or procedures shall specify: a Vehicles on which the guard can be installed. Vehicles may be designated by listing the make and model of the vehicles for which the guard is suitable, or by specifying the design elements that would make any vehicle an appropriate host for the particular guard e.

This description shall be detailed enough to permit the agency to locate and duplicate the chassis surface during compliance testing. The principal aspects of vehicle chassis configuration that are necessary to the proper functioning of the guard shall be specified. If the chassis strength is inadequate for the guard design, the instructions or procedures shall specify methods for adequately reinforcing the vehicle chassis.

Procedures for properly installing any guard attachment hardware shall be provided. Guard Test Procedures. The procedures for determining compliance with S5.

For hydraulic guards, the horizontal member of the guard is deflected in a forward direction until the hydraulic unit s have reached the full extent of their designed travel or mm, whichever occurs first.

The hydraulic units are compressed before the application of force to the guard in accordance with S6. If the manufacturer did not use one of these devices or does not specify a device when asked by the agency, the agency may choose either of the following devices - 1 A rigid test fixture. In the case of testing on a rigid test fixture NHTSA will consult the installation instructions or procedures to determine the surface or structure that the guard is supposed to be mounted to and mount it to the rigid test fixture in the same way.

The trailer chassis is secured so that it behaves essentially as a fixed object during the test, such that the test must be passed no matter how little it moves during the test. The force application device employed in S6. The steel solid is mm in height , mm in width, and 25 mm in thickness. The mm by mm face of the block is used as the contact surface for application of the forces specified in S5. Each edge of the contact surface of the block has a radius of curvature of 5 mm plus or minus 1 mm.

With the guard mounted to the rigid test fixture or to a complete trailer , determine the test locations P1, P2, and P3 in accordance with the procedure set forth in S6. Before applying any force to the guard, locate the force application device such that: a The center point of the contact surface of the force application device is aligned with and touching the guard test location, as defined by the specifications of S6.

After the force application device has been positioned according to S6. Load application procedures are specified in the S6.

If the guard manufacturer does not designate a rate, any rate within that range may be chosen. For calculation of guard energy absorption, the value of force is recorded at least ten times per 25 mm of displacement of the contact surface of the loading device. Reduce the force until the guard no longer offers resistance to the force application device.

Produce a force vs. Determine the energy absorbed by the guard by calculating the shaded area bounded by the curve in the force vs. At all times during the application of force, the location of the longitudinal axis of the force application device remains constant.


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