Further Development of the Safety and Congestion Relationship for Urban Freeways (2014) / Chapter Skim
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3Background SHRP 2 Reliability Project L07 has focused specifically on the identification and evaluation of design treatments that can be used to reduce delays due to nonrecurrent congestion and improve travel time reliability (1)
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4increase to the point that rear-end or sideswipe (e.g., lane changing) crashes become more frequent.
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5 To ta l C ra s he s pe r M VM T 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 FI Cr a s he s pe r M VM T 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Traffic density (pc/mi/ln)
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6To ta l C ra s he s pe r M VM T 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Traffic density (pc/mi/ln) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 FI C ra s he s pe r M VM T 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 Traffic density (pc/mi/ln)
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7 • Subtask 5C. Develop safety-congestion relationships for each selected area.
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