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Complete Regional Transportation Plan 2012 - Cape Cod ...

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Based on Crash Rate: A crash rate for an intersection compares thenumber of crashes to the number of vehicles passing through it. The crashrate is interpreted as number of crashes per million entering vehicles. It ispossible an intersection with many crashes is not geometrically flawed orin poor condition, but merely a victim of the law of averages – manyentering vehicles inflating the number of crashes. The crash rate methodattempts to distinguish intersections with safety problems relative to theirusage.Based on EPDO Rate: This method is based on the same idea as usingthe crash rate, whereas it compares an intersection’s EPDO to its usage.The EPDO rate is interpreted as EPDO per million entering vehicles. Thevehicle with the largest EPDO rate is ranked number one under thismethod.Base data for this analysis was provided by the Massachusetts Department of<strong>Transportation</strong> (MassDOT) in the form of geographically located crash clusters. The dataprovided by MassDOT included the number of reported crashes at each intersection andthe severity of the crashes. It should be noted, however, that this dataset only includesincidents whose reports contained enough information to accurately locate them. Of the12,001 crash reports collected by the Massachusetts Registry of Motor Vehicles, 9,220incidents were located by MassDOT. The incidents are mapped on the following figure.FIGURE 1 - CAPE COD LOCATED CRASHES 2006-2008(Source: MassDOT Crash Records 2006-2008)<strong>Cape</strong> <strong>Cod</strong> <strong>Regional</strong> <strong>Transportation</strong> <strong>Plan</strong> | August 2011Chapter 3: SafetyPage 273

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