Table 1.
Descriptive statistics of variables associated with vehicle defect crashes.
| Variable | Frequency | Percentage | |
|---|---|---|---|
| Crash Severity | Major Injury | 681 | 4.52 |
| Minor Injury | 2962 | 19.68 | |
| No Injury | 11411 | 75.8 | |
| Primary Contributing Factors | Defective equipment | 7611 | 50.56 |
| Driving too fast for condition | 1051 | 6.98 | |
| Misjudging stopping distance | 973 | 6.46 | |
| Followed too close | 901 | 5.99 | |
| Ran off road | 417 | 2.77 | |
| Other -No improper driving | 328 | 2.18 | |
| Ran traffic signal | 248 | 1.65 | |
| Driving under influence (DUI) | 129 | 0.86 | |
| Other | 3396 | 22.56 | |
| Gender | Male | 9899 | 65.76 |
| Female | 5155 | 34.24 | |
| Driver Age | 15–19 | 2225 | 14.78 |
| 20–39 | 7873 | 52.3 | |
| 40–59 | 3627 | 24.09 | |
| more than 60 | 1329 | 8.83 | |
| Manner of Crash | Single vehicle crash | 6282 | 41.73 |
| Rear end | 4048 | 26.89 | |
| Side impact (90°) | 693 | 4.6 | |
| Side impact (angled) | 632 | 4.2 | |
| Head on | 283 | 1.88 | |
| Other | 3116 | 20.7 | |
| First harmful event | Collision with Vehicle in Traffic | 6092 | 40.47 |
| Vehicle Defect/Component Failure | 1746 | 11.6 | |
| Collision with Ditch | 731 | 4.86 | |
| Collision with Tree | 474 | 3.15 | |
| Overturn/Rollover | 385 | 2.56 | |
| Collision with Concrete Barrier | 349 | 2.32 | |
| Ran Off Road Right | 898 | 5.97 | |
| Ran Off Road Straight | 101 | 0.67 | |
| Ran Off Road Left | 498 | 3.31 | |
| Other | 3780 | 25.11 | |
| Safety Equipment | Shoulder and Lap Belt Used | 13296 | 88.32 |
| No safety equipment used | 630 | 4.18 | |
| Unknown | 1128 | 7.49 | |
| Airbag status | Airbag deployed | 2754 | 18.29 |
| Airbag not deployed | 10496 | 69.72 | |
| Airbag not installed | 1437 | 9.55 | |
| Others | 367 | 2.44 | |
| Vehicle Age | 0–5 years | 2319 | 15.4 |
| 6–10 years | 2640 | 17.54 | |
| more than 10 years | 10095 | 67.06 | |
| Vehicle Type | Passenger Car | 6790 | 45.1 |
| Pick-Up (Four-Tire Light Truck) | 3154 | 20.95 | |
| Sport Utility Vehicle (SUV) | 2770 | 18.4 | |
| Tractor/Semi-trailer | 872 | 5.79 | |
| E Single-Unit Truck (2-Axle/6-Tire) | 262 | 1.74 | |
| Others | 1206 | 8.01 | |
| Contributing vehicle defect | Brakes | 6326 | 42.02 |
| Tire Blowout/Separation | 3374 | 22.41 | |
| Improper Tread Depth | 1628 | 10.81 | |
| Headlights | 109 | 0.72 | |
| Wheels | 849 | 5.64 | |
| Taillights | 110 | 0.73 | |
| Others | 2658 | 17.66 | |
| Driver Employment Status | Employed | 8566 | 56.9 |
| Unemployed | 2491 | 16.55 | |
| Self-employed | 875 | 5.81 | |
| Retired | 553 | 3.67 | |
| Others | 2569 | 17.07 | |
| Roadway curvature and Grade | Straight and Level | 9225 | 61.28 |
| Straight with Down Grade | 1963 | 13.04 | |
| Straight with Up Grade | 1149 | 7.63 | |
| E Curve Left and Down Grade | 445 | 2.96 | |
| Others | 2272 | 15.09 | |
| Weather | Clear | 9296 | 61.75 |
| Cloudy | 2735 | 18.17 | |
| Rain | 2462 | 16.35 | |
| Others | 561 | 3.73 | |