The vehicle must be driven into and out of the judging lanes.
The vehicle's motor must be used to propel the vehicle into and out of the judging lanes. (Starter motors, etc. may not be used as a means of propulsion.)
Some events may prohibit the operation of motor vehicles. In situations such as this, or when safety is an issue, compliance with this rule is waived.
The size and location of the vehicle's doors must not be altered.
Extreme competitors may install "bolt tabs" or a "bolt strip" (for securing the doors) along the perimeter of the door openings provided the maximum width of each tab or strip is less than 2 inches (5.08 cm). If a bolt tab or bolt strip is attached to the B-Pillar, it must be easily removable to permit compliance with the "string test".
At a minimum, the vehicle must have a door for the driver and another for the passenger. Each of these doors must be located in the traditional locations for the driver and passenger. (i.e. Opposite sides of the vehicle.) Exception: Vehicles that were originally manufactured with only one door. (i.e. Mail delivery jeep.)
The OEM glass in the vehicle may be replaced provided the following conditions are met.
Only OEM equivalent glass with a maximum thickness of 0.275 inches (7 mm) may be used.
Super Street Division
Laminated windshields (2 OEM Max) are now permitted. The maximum total glass thickness is 0.550 inches (14 mm).
The OEM glass in the windshield and / or side windows of the vehicle may be replaced with another material as long as that material approximates the location and functionality of the original equipment. (i.e. Plexiglas, bullet-proof glass, or another fully transparent material.)
The "slant" of the replacing material must approximate that of the OEM glass.
The maximum total thickness for any replacement material is 4 inches (10.16 cm).
The relationship between the dash and the windshield shall be such that the sensor can be placed on the windshield and the proper distances from the sensor to the dash (4 inches or 10.16 cm) and the sensor to the windshield pillar (12 inches or 30.48 cm) can be achieved.
The unobstructed viewing area for the front windshield must be 4 square feet (0.3716m^2) or larger. The unobstructed viewing area must be symmetrical in nature, with equivalent transparent areas on both the driver and passenger sides of the vehicle. Important: Only areas of the windshield that are not impeded in any way will be considered unobstructed.
There is no limit to the number of external windshield braces that may be used as long as their existence does not violate other applicable rules.
A secondary windshield and / or windows may be used in conjunction with the OEM glass as long as the maximum distance separating the two materials does not exceed ¼ inch (6.35 mm) at the center of the windshield and / or window.
The unobstructed viewing area for the driver and passenger side windows must be 200 square inches (1290cm^2) or larger (per window).
Side windows do not need to be operational. (They don't need to roll up or down.)
Competitors who have replaced the passenger side windows with Plexiglas or another similar material must provide a 1-inch (2.54 cm) diameter hole (with stopper) through a transparent area of the material for the measurement sensor cable.
Modifications to the external OEM "skin" (body) of the vehicle are not permitted if the modification in question will result in a change in the vehicle's interior volume. The dBDRA defines the "skin" of the vehicle as the external shell (top, front, back, and sides) of the vehicle's OEM body that gives the vehicle its distinctive appearance. This is also the part of the vehicle that is normally painted. The underside or undercarriage of the vehicle is not considered to be a part of the OEM "skin".
"Chop-tops" are prohibited.
Non-OEM extended roofs are prohibited.
Non-OEM vehicle extensions or "stretches" are prohibited.
Cut-throughs in pickup trucks are permitted in the Super Street, and Extreme Divisions provided the enclosure and / or other equipment that is located in the bed of the truck does not extend above the sidewalls of the bed. If the pickup has a commercially available bed cover (camper shell or tonneau cover), then the sidewall restriction does not apply.
Modifications that are strictly cosmetic in nature, or that do not affect the internal volume of the vehicle are permissible. This includes spoilers, hood scoops, air dams, fender flares, etc.
Crushing in the roof or the doors of the vehicle in such a manner as to alter the vehicle's interior volume is prohibited.
External bracing on the skin of the vehicle is prohibited.
The officiating staff must be afforded a clear view inside of the vehicle when looking through the windshield and side windows of the vehicle. Window tint, stickers, or other materials which could occlude the judge's view may not be placed on the windshield within a 6 inch (15.24 cm) radius of the sensor placement location.
Window tint (including clear film) may not be applied to external window surfaces in the Stock Division. A single layer of clear tint may be applied to the exterior window surfaces in the Super Street and Extreme divisions.
A single layer of window tint may be used on the interior window surfaces in all divisions provided rule 4-5 is not violated.
If a competitor breaks a window during the normal course of competition (at the show) then clear tape may be used on both the internal and external surfaces of the broken window provided no other applicable rules are violated.
Window tint with an opacity that is greater than 35% will generally violate this rule. In these cases the judge may require the competitor to remove the tint in order to comply with this rule.
Applying tint to the windshield may violate the law. It is the competitor's responsibility to comply with any laws which may apply to his or her vehicle.