Rethink crash risks: What does the data say?
Most commercial motor vehicle (CMV) crashes occur under conditions that one might view as favorable, DOT data suggests.
The Federal Motor Carrier Safety Administration (FMCSA) tracks several environmental variables associated with CMV crashes. The following three conditions are taken from crash data occurring in CY 2023.
Condition | Number of crashes |
Daylight | 121,848 |
Dark, not lighted | 22,959 |
Dark lighted | 18,729 |
Dark, unknown roadway lighting | 823 |
Dawn | 4,471 |
Dusk | 2,104 |
Other | 159 |
Unknown | 226 |
Condition | Number of crashes |
Dry | 138,516 |
Ice | 3,534 |
Sand, mud, dirt, oil, or gravel | 466 |
Slush, snow | 3,191 |
Water, standing or moving | 353 |
Wet | 23,610 |
Other | 137 |
Missing | 309 |
Unknown | 1,304 |
Condition | Number of crashes |
Clear | 139,862 |
Blowing sand, soil, dirt, or snow | 818 |
Fog, smog, smoke | 1,476 |
Rain | 16,223 |
Severe crosswinds | 473 |
Sleet, hail | 821 |
Snow | 3,847 |
Other | 5,508 |
Missing | 377 |
Unknown | 2,043 |
Digging into more data
The data reveals that most crashes occur when situations don’t appear to be threatening.
However, one might argue that the data on lighting conditions might be biased since most CMVs are operated during daylight hours. This argument nevertheless doesn’t explain why most accidents occur when roads are dry and the weather is clear. Often many other factors come into play resulting in an accident, so you may need to sift through more crash data.
For example, in CY 2022 fatal CMV crashes typically occur on Tuesday, Wednesday, or Friday. These three days were evenly split as having the most crashes. One might conclude that the traffic flow on these days must be similar.
Type of road is also another crash variable. In that same year, most fatal crashes occurred:
- On principal arterial road, and
- Two-way trafficways, not divided.
Specific to location, rural settings were a little higher in number of fatal crashes, but not enough to say there is a trend.
And not surprising, considering the lighting condition statistics, most fatal crashes occurred between 6:00am and 6pm, with no significant differences in one-hour increments during the 12-hour period.
What can you learn from the numbers?
When looking at statistics, you must be careful not to take them out of context or manipulate them to say what you want. When considering FMCSA-tracked crash variables, it is clear that an accident can happen anywhere at any time. Risk is not limited to adverse driving conditions.
Each driving situation has its own set of challenges, and drivers must employ defensive driving techniques based on location, road conditions, weather, and the like.
Key to remember: Drivers should always be attentive and never complacent even if the weather and road conditions appear ideal.