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9_15_11_TravelData

# 9_15_11_TravelData - DDHV DDHV = directional design hour...

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CE4001 Transportation Safety 1 DDHV DDHV = directional design hour volume How do you think this could be computed from AADT?

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CE4001 Transportation Safety 2 DDHV DDHV = AADT*K*D D = proportion of peak hour traffic traveling in the peak direction of flow K = proportion of daily traffic occurring during the peak hour But which peak hour? The highest peak hour?
CE4001 Transportation Safety 3 DDHV K = proportion of daily traffic occurring during the peak hour For design, K factor is often taken from the 30th peak hour when ranked in descending order

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CE4001 Transportation Safety 4 Typical D and K factors Facility Type Normal Ranges of Values K D Rural Suburban Urban Radial Urban Circumf. Take a guess at filling this table
CE4001 Transportation Safety 5 Table 1. Typical K and D Values (Source: Roess, Prassas, McShane. Traffic Engineering ) Facility Type Normal Ranges of Values K D Rural 0.15-0.25 0.65-0.80 Suburban 0.12-0.15 0.55-0.65 Urban Radial 0.07-0.12 0.55-0.60 Urban Circumf. 0.07-0.12 0.50-0.55 Do these values agree with your experiences?

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CE4001 Transportation Safety 6 DDHV Factors DDHV = AADT*K*D K and D are a function of the role of the road. STL e.g.: Do K and D values differ between say I-44 and I- 270? Why or why not?
CE4001 Transportation Safety 7 DDHV Factors DDHV = AADT*K*D K and D are a function of the role of the road. Do K and D values differ

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9_15_11_TravelData - DDHV DDHV = directional design hour...

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