Appendix A to Part 1240 - Adjustment Procedures for State-Submitted Information (Calendar Years 1996 and 1997)
23:1.0.2.14.8.4.1.1.42 : Appendix A
Appendix A to Part 1240 - Adjustment Procedures for State-Submitted
Information (Calendar Years 1996 and 1997)
A. In States where State-submitted information on seat belt use
rates does not include data for Front outboard occupants in
passenger motor vehicles (FOPV), an adjustment will be made based
on the national ratio of seat belt use rates for FOPV to the seat
belt use rate for the group of occupants and vehicles that were
included in the State-submitted information. The national seat belt
use rates will be derived from the most recent National Occupant
Protection Use Survey (NOPUS). For each affected State, the
adjustment will be made by dividing the NOPUS seat belt use rate
for FOPV by the NOPUS seat belt use rate for the surveyed group, or
the seat belt use rate for the closest available group to the
surveyed group. The NOPUS seat belt use rate for FOPV will be
derived for each affected State by weighting the NOPUS seat belt
use rates for passenger cars and for passenger motor vehicles that
are not passenger cars (hereafter LTVs) by the relative number of
registrations of passenger cars and LTVs in each State. This method
will produce a factor which will be multiplied by the State's
survey-based seat belt use rate to produce an adjusted seat belt
use rate reflecting the required vehicle and occupant
population.
B. The process may be expressed mathematically as follows:
Ua = Us((Npc * Rpc + Nltv * Rltv) / Ns) Where: Ua = the adjusted
State seat belt use rate Us = the State-submitted seat belt use
rate Npc = the national front outboard passenger car seat belt use
rate from NOPUS Nltv = the national front outboard LTV seat belt
use rate from NOPUS Rpc = the portion of State passenger motor
vehicle registrations that are passenger cars Rltv = the portion of
State passenger motor vehicle registrations that are LTVs Ns = the
national seat belt use rate for the State-surveyed vehicle and
occupant population (or closest available group from NOPUS)