Windshield Damage Index (WDI) Procedure

The Windshield Damage Index (WDI) is used to classify and describe the damage occurring to a vehicle's front windshield following an impact with a temporary workzone device. This me~sure consist$ of an 8-digit classification which is used for each iinpact with a device and may be repeated if more than one region of the windshield is damaged.

Columns 1 and 2 Windshield Damage Rating (WDR)

The Windshield Damage Rating (WDR) is used to describe the type of damage occuning to the front windshield.The scale ranges from 1to 10with various levels within some categories. For the 10scale ranges, the first five coincide with an ,acceptablerating,whUe the last five coincide with an unacceptable rating. The ten rating indexes are described in detail and are shown in Table 1. The scale ratings 1 through 4 and 7 through 10 will be much easier to evaluate than ratings 5 and 6 which He in the middle and may be controversial initially.

However, with increased crash testing experience and the collection of data on damaged windshields, we believe that eventually test agencies will be,capable of using the 8-digit code to remove the subjectivity (or most of it) when detennining passes or fails. Col~ns 3 through 8 are used to describe the physical geometry of each damaged region as well as its size. It is hoped U'Jathis infonnation wo~Jdeventually form the basis for levels or magnitudes of acceptability. Consequently, only at that point in the evaluation process would objectivity be almost guaranteed

Column 3 Zone

The front windshield is divided up into three quadrants using equally-spaced vertical lines. The areasbetween those lines are fefetTedto as the three zones –left, middle, and right. These zones are detennined when sitting in the vehicle and looking forward. Each damage location must have a specific zone which is based on the majority of the damage residing in that zone.

1. Left 1/3 quadrant of windshield
2. Middle 1/3 quadrant of windshield
3. Right 1/3 quadrant ofwindshield

Column 4 Vertical Position

The three zones are subsequently subdivIded into three subregions using equally-spaced horizonta! lines. These three subregions proVideinformation as to the vertical position of the damage within each zone -top, center, and bottom.

1. T – Top horizontal region or slice in a given quadrant
2. C – Center hori~onta]region or slice in a given quadrant
3. B – Bottom

Column 5 Horizontal Position

For each vertical pqsition or horizontal slice within a given zone, a horizontal positiorais provided along the slice using equally-spaced vertical lines. These three subregions provide the final infonnation as to the horizontal position of the damage within each zone and vertical.position – left, center, and right.

1. L - Left
2. C - Center
3. R - Right

Column 6 Shape

For each specific damage location, the depth of indentation (DI) Ofthe windshield glass is to be measured using a standardized technique, such as that proposed by E-TECH Testing Services or similar to it. Five measurement 1evelare to be used and are provide below.

1. E – Elliptical
2. C – Circular
3. R – Rectangular
4. D – Diamond
5. T – Triangular
6. O – Other

Column 7 Depth of Indentation (DI)

For each specific damage location, the depth of indentation (DI) Ofthe windshield glass is to be measured using a standardized technique, such as that proposed by E-TECH Testing Services or similar to it. Five measurement 1evelare to be used and are provide below.

1. 0 < DI < ½ "
2. ½ < < 1 "
3. 1 < DI < 1½ "
4. 1½ < DI <2 "
5. DI &glt; 2

Column 8 Extent of Indentation (EI)

For each specific damage location, the extent of indentation (EI) or measured surface area of the hldented region is to be calculated. Five measurement leveJs are to be used and are provided below.

1. 0 in.²
2. 0 < EI < 20 in.²
3. 20 < EI < 50 in.²
4. 50 < EI < 100 in.²
5. EI > 100 in.²

Windshield Damage Index (WDI): Damage Location

Column 3: Zone	Column 4: Vertical Position
Column 5: Horizontal Position	Columns 3, 4, and 5 combined
Damage Sketch Template Test No._______________________________ Notes: (Shape, Indentation, Visibility, Penetration, etc.

Windshield Damage Worksheet

Windshield Damage Diagram (Draw damage areas, include major dimensions.)

Dimensions: (note units)

For each area of damage, note the following: (indicate options if only one area of damage)

Shape (general, indicate the actual shape for the windshield diagram above:

E – Elliptical	C – Circular	T – Triangular
R – Rectangular	D – Diamond	0 – Other

Shape, Dl, El and other notes: