A significant number of crashes on roads are caused by adverse weather conditions. Among the most serious consequences of rainfall and flooding in regard to road safety are the motor vehicle-related flash flood fatalities. These fatalities are of particular concern in Texas. Information on motor vehicle fatalities caused by flash floods was extracted from the National Climatic Data Center Storm Data reports. Review of reports on flash flood fatalities in general, where the death circumstances are provided, reveals that most fatalities are motor vehicle-related (80%). Moreover, data from the reports indicate that from 1959 to 2009 the number of motor vehicle-related flash flood fatalities in Texas exceeds by far the total number of flood fatalities in any other state. Demographic analysis of the flash flood fatalities indicates that, in Texas, all ages are at risk and that males are much more affected than females. Spatial analysis indicates that the highest numbers of fatalities occur in counties having major urban areas. The increase in the frequency and intensity of storms and floods that is projected to result from climate changes and variability, and the rapid urbanization in the region may considerably increase the impacts of weather on road safety in Texas.
This study uses fatal crash data and geospatial analysis to examine the temporal and spatial distribution of rain-related fatal crashes in Texas from 1982 to 2011. The data were obtained from the Fatality Analysis Reporting System maintained by the National Highway Traffic Safety Administration. The GetisÀOrd G i à (d i ) statistic was used to identify spatial clustering patterns of rain-related fatal crashes and their correlation with rainfall and compare them to spatial patterns of other crashes. The spatial statistical analysis reveals spatial patterns for rainrelated crashes that are clustered in different areas at different levels of confidence. The temporal variability of raw and normalized fatal crashes and rain-related crashes was also investigated at the state level. Although the population of Texas increased by more than 67% over the study period, with a corresponding increase in the number of vehicles, the fatal crashes and rainrelated crashes in Texas did not increase but decreased instead. Results suggest that rain is a contributor to crashes in few counties but at less than 95% confidence in some of the wetter counties. These counties should be the focus of further research and detailed analysis to identify underlying crash contributing factors such that safety countermeasures can be developed.
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