Contoured means, with respect to a door, that the lower portion of its front or rear edge is curved upward, typically to conform to a wheel well.
Double side doors means a pair of hinged doors with the lock and latch mechanisms located where the door lips overlap.
Limited line manufacturer means a manufacturer that sells three or fewer carlines, as that term is defined in 49 CFR 583.4 , in the United States during a production year.
Lowered floor means the replacement floor on a motor vehicle whose original floor has been removed, in part or in total, and replaced by a floor that is lower than the original floor.
Modified roof means the replacement roof on a motor vehicle whose original roof has been removed, in part or in total.
Raised roof is used as defined in paragraph S4 of 49 CFR 571.216 .
Walk-in van means a special cargo/mail delivery vehicle that has only one designated seating position. That designated seating position must be forward facing and for use only by the driver. The vehicle usually has a thin and light sliding (or folding) side door for easy operation and a high roof clearance that a person of medium stature can enter the passenger compartment area in an up-right position.
TI(d) = 1/2(GR + GLS)
Where the term "GR" is the greater of the peak accelerations of either the upper or lower rib, expressed in g's and the term "GLS" is the lower spine (T12) peak acceleration, expressed in g's. The peak acceleration values are obtained in accordance with the procedure specified in S11.5.
Where the term a is the resultant head acceleration at the center of gravity of the dummy head 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 and where t1 is less than t2.
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.
Where the term a is the resultant head acceleration at the center of gravity of the dummy head 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 and where t1 is less than t2.
Where the term a is the resultant head acceleration at the center of gravity of the dummy head 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 and where t1 is less than t2.
49 C.F.R. §571.214