COST OF 2005 MOTOR VEHICLE OCCUPANT INJURIES IN IDAHO BY COUNTY

The following tables were developed to show the costs associated with motor vehicle collisions and specifically how seat belt use age affects the costs. The data has been limited to occupants of passenger motor vehicles over the age of four with known injury types. The total number of motor vehicle occupants, the number using seat belts, the number not using seat belts, the number with unknown seat belt use, and the expected totals (assuming 100% seat belt use) are shown by injury type for each county. The costs associated with the injuries are also shown.

Tables - 2005 Costs & Seat Belt Use Savings By County (Excel)

The costs are based on Federal Highway Administration estimates for collisions and are updated to represent 2005 dollars: each fatality costs $3,321,330; each serious injury costs $229,938; each visible injury costs $45,988; each possible injury costs $24,271. The costs are comprehensive and encompass many different components including medical, pre-funeral, emergency service, vocational rehabilitation, market production, household production, insurance administration, workplace, legal/court, travel delay and property damage costs.

Just over 70% of these costs are paid by the general public through insurance premiums, taxes, direct out-of-pocket payments for goods and services and increased charges for medical care. The remaining 30% of the costs are paid by the individuals involved in the collisions.

The number in the “100% Use Expected Totals“ column are the number of persons killed and injured that we would have expected if, every occupant that was not wearing a seat belt, had been wearing a seat belt. These numbers are based on estimates by the National Highway Traffic Safety Administration that seat belts are about 50% effective in preventing fatalities and serious injuries.

For example, if 7 people were killed that were not wearing seat belts. Assuming all 7 had been wearing seat belts, half of them would have survived and half would have been killed. To get the expected number killed, we take half of the persons not wearing seat belts that were killed = 3.5 plus the 8 that were wearing seat belts and were killed plus the 2 with unknown seat belt use is equal to 13.5 – which rounds up to 14. The other 3.5 (that would have survived) are added into the serious injuries. The expected number of serious injuries is equal to the number of belted serious injuries plus half of the unbelted serious injuries plus half of the unbelted people killed plus the number with unknown seat belt use. (186 + (49/2) + (7/2) = 186 + 24.5 + 3.5 +2 = 216). For simplicity, we assume that the serious injuries that would have been prevented became visible injuries. The savings is equal to the total cost minus the 100% use expected total cost.