How vendors and TOWNS HIDE ACCIDENTS:  DISTANCE Game!  Chart from www.stpetecameras.org

Ban the Cams came across this great CHART that shows how some places use distantance to HIDE accidents. 

Quote:

The fourth point of data, related to the third point, is the distance from intersection crash inclusion zone, and it is not defined in most of the included studies, but it can be very important to understanding the crash data. Some municipalities have a fixed value for this, and some do not use one at all, instead relying entirely on the reporting police officer or citizen to determine whether an accident was “intersection-related” or not. Some municipalities use a very limited distance, like the City of Plano, TX which counts only crashes that happen within 30 feet of the intersection as being tied to that intersection (This is the same standard reportedly used by the Texas Department of Transportation although an official from the TxDOT denies that any fixed distance is mandated in that state), and as you can see from Figure 1-1 using such a limited distance removes any crashes that happen beyond two car-lengths from the intersection from these statistics. In light of the 2010 study by the University of Illinois at Chicago which compares the crash statistics from the Chicago Department of Transportation(CDOT), which uses 25-50 feet, and the Illinois Department of Transportation(IDOT) which uses 150 feet, we can see that using such a limited distance from intersection does skew the results and removes many rear-end crashes from being associated with the intersection that the crash occurred near.

Figure 1-1 – Different crash distances by state and city

The standard Distance From Intersection used in many states as well as the Federal Highway Administration(FHWA) is 100 feet or higher.

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File	Description
RLCSTUDIES_metastudy_20101211 figure 1.1.jpg
RLCSTUDIES_metastudy_20101211.pdf

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