Attachment K

 

MOTOR VEHICLE FIRES IN TRAFFIC CRASHES
AND THE EFFECTS OF THE FUEL SYSTEM INTEGRITY STANDARD [FMVSS 301]
National Highway Traffic Safety Administration
Office of Standards Evaluation
November 1990

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Principal Findings


The Frequency of Fires in Motor Vehicle Crashes

* Motor vehicle fires in all police-reported traffic crashes are relatively rare, occurring at the rate of approximately 3 fires for every 1,000 vehicles involved in crashes.

* For all vehicles involved in fatal crashes, fires are considerably more frequent, with about 26 fires per 1,000 vehicles in crashes - nearly 9 times the rate for all crashes.

* For each of the 3 classes of vehicles of primary interest in this study - passenger cars, light trucks, and school buses, the fire rate and estimated number of fire crashes annually are:

 

Fires per 1,000 Vehicle Crashes

Total Number of Fires Annually

Passenger cars

2.9

23,600

Light truck

2.9

5,200

School buses

2.4

60

* For Injury crashes involving passenger cars or light trucks, the fire rate is higher at 7 to 8 fires 1,000 crashes.

* Fire in fatal collisions of passenger cars has increased significantly over the last several years, from 20 per 1,000 crashes in 1975 to 28 per 1,000 crashes 1988. A primary reason for this increase is believed to be an increasing proportion of older vehicles in the car population. Older vehicles are more likely to experience fire, given a crash. The fire rate was not found to be related to car size, as defined by vehicle curb weight. Therefore, the trend to smaller cars over the last several years does not appear to be a factor in the increased rate of fires in fatal passenger car crashes.

Casualties in Fire Crashes

* From 1975 to 1988, over 1,600 people per year died in vehicles involved in fire crashes. The number of fire-related fatalities has increased over the 14-year period, from 1,300 in 1975 to over 1,800 in 1988, due primarily to the increase in fire rate for passenger cars.

* Slightly more than 4 percent of all occupant fatalities occur in fire crashes. For passenger cars, the rate is just under 4 percent, and for light trucks, the rate is 5 percent.

* Over the same period, total estimated occupant casualties in fire crashes involving cars and light trucks, annually, are:

Number of Casualties

Injury Severity

Passenger Cars

Light Trucks

K (fatal)

1,020

345

A (serious)

2,900

600

B (moderate)

4,300

800

C (minor)

2,800

500

* The available sample of school bus fires was insufficient for estimating occupant casualties in fire crashes.

The Effectiveness of FMVSS 301

Passenger Cars:

* It is estimated that FMVSS 301 has reduced fires in all passenger car crashes by 14 percent. This translates to 3,900 fewer fires annually, once the entire car fleet has been modified in accordance with the Standard's requirements. Presently, about 85 percent of the car fleet contain these modifications.

* Some evidence exists that fire rates in injury crashes may be lower for post-standard vehicles, but the information is insufficient for definitive statistical conclusions.

* In fatal passenger car crashes, there was no significant reduction in the fire rate for vehicles produced after the Standard took effect. Fire is associated with the more severe impact crashes which also tend to be fatal crashes.

Light Trucks:

* No significant reduction in crash fires was found for post-standard light trucks, both for all police-reported crashes, and fatal crashes alone. While data were insufficient for analysis of fire rates in injury crashes, the finding of no fire reduction for all crashes or for fatal crashes implies that none would be found for injury crashes as well.

School Buses:

* Data were insufficient to develop reliable estimates of the effect of FMVSS 301 for school buses.


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