Further Development of the Safety and Congestion Relationship for Urban Freeways (2014) / Chapter Skim
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8Research Approach and State-by-State Results To determine a relationship between safety and congestion for use in evaluating design treatments, relationships between crash rates and level of service (LOS) were developed based on traffic operational and crash data obtained from instrumented directional freeway segments in five metropolitan areas: Seattle, Washington; Minneapolis–St.
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9 Level of service was computed for each 15-min record using the operational analysis procedure presented in the 1994 Highway Capacity Manual (HCM) Chapter 23 (2)
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10 between density and crash rates. The 18 LOS categories selected are shown in Table 2.2.
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11 capacity. Thus, the study period for Minneapolis–St.
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12 Table 2.5. Site Distribution Characteristics for Directional Freeway Segments in the Sacramento Metropolitan Area Number of Directional Lanesa Number of Sites Length (mi)
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13 Severity level FI PDO Total Cr a s he s pe r M VM T 0 1 2 3 4 5 6 7 8 9 10 Traffic density (pc/mi/ln) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Figure 2.4.
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14 Severity level FI PDO Total Cr a s he s pe r M VM T 0 1 2 3 4 5 6 7 8 9 10 11 Traffic density (pc/mi/ln) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Figure 2.5.
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