The normalized working width is the size by which the deformation of the struck boundary is measured. The working width is the main parameter to calculate the scope of the free space left behind by the boundary, which is necessary for the operation of the restraint system. This is the distance to the rear edge of the deforming system from the front edge of the deformed, heavy-weight collision. The working width is divided into eight class W1 to W8. The following table 1.2 is characterized by different work-width classes and corresponding values in meters.

Table ' EN 1317 working widths and corresponding working width classes '