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<br />Traffic Impact Study 7 <br />New Brighton Exchange Update <br /> <br />The observed Crash Rate is the number of crashes per million entering vehicles (MEV). <br />This formula uses the total traffic, crashes, and time frame to provide a standard format <br />for comparison between intersections. Although the study intersections can be <br />compared together, a better measure is against the state averages for similar types of <br />intersections (in traffic control type and volume). <br /> <br />Another comparison tool is the Critical Rate, which is a statistically adjusted Crash Rate <br />to account for the random nature of crashes. An observed Crash Rate greater than the <br />Critical Rate indicates that the intersection operates outside the expected, normal <br />range. <br /> <br />Table 2 summarizes the historic crash data and calculated rates for the recent 2017 <br />through March 2019 period. The rates from the 2009 through 2019 period were very <br />similar to this more recent period. <br /> <br />Table 2 – Intersection Crash Data (2017 – March 2019) <br />Intersection Total <br />Crashes <br />Observed <br />Crash <br />Rate* <br />Critical <br />Crash <br />Rate* <br />Old Hwy 8 & 14th St 2 0.18 0.35 <br />Old Hwy 8 & Central Park Blvd 2 0.18 0.36 <br />Old Hwy 8 & Northwest Pkwy 2 0.17 0.34 <br />*Rates are per million entering vehicles. <br /> <br />As shown in Table 2, the three study intersections have crash rates within the normal <br />range of what would be expected. It is noted that no fatal crashes have occurred at <br />these study intersections between 2009 and March 2019. <br /> <br />