Ragna Hoffmann
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View article: Observations on the Relationship between Crash Frequency and Traffic Flow
Observations on the Relationship between Crash Frequency and Traffic Flow Open
This work analyzes the relationship between crash frequency N (crashes per hour) and exposure Q (cars per hour) on the macroscopic level of a whole city. As exposure, the traffic flow is used here. Therefore, it analyzes a large crash data…
View article: Visualizing crash data patterns
Visualizing crash data patterns Open
This paper demonstrates an approach that makes it easy to find patterns in traffic crash data-bases, and to specify their statistical significance. The detected patterns might help to prevent traffic crashes from happening, since they may …
View article: The Safety Impact of Additional Blue Lights of Rescue Vehicles
The Safety Impact of Additional Blue Lights of Rescue Vehicles Open
This work is a preliminary study on behalf of the Bavarian Red Cross (BRK). It examines if and to what effect an impact on traffic safety can be measured when BRK ambulance vehicles are equipped with additional blue lights on the front fen…
View article: Calculation of Error Rates for Detection of Critical Situations in Road Traffic
Calculation of Error Rates for Detection of Critical Situations in Road Traffic Open
This article is a contribution to the development of methods for road safety analysis. A calculation scheme is derived for error rates of critical situations detected automatically using a road side stationary detector. A situation is clas…