Incorporating Travel Time Reliability into the Highway Capacity Manual (2014) / Chapter Skim
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225 This appendix documents the default values used in the various procedures of the scenario generation stage of the urban streets reliability methodology. Weather Event Procedure The weather event procedure is based on the weather characteristics identified in the following list.
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226 Table H.1. Default Mean Number of Days with Precipitation JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC BIRMINGHAM AP, AL 11 10 10 9 9 10 12 9 7 6 8 10 HUNTSVILLE, AL 11 9 11 9 10 9 10 8 8 7 9 10 MOBILE, AL 10 9 9 7 8 11 15 13 9 6 7 9 MONTGOMERY, AL 10 9 9 7 8 9 11 9 7 5 7 9 FLAGSTAFF, AZ 7 7 8 5 4 2 11 12 6 5 5 6 PHOENIX, AZ 3 4 3 1 0 0 4 4 2 2 2 3 TUCSON, AZ 4 3 3 1 1 1 9 9 4 3 2 4 WINSLOW, AZ 4 4 4 3 2 2 6 8 5 3 3 4 YUMA, AZ 3 2 2 1 *
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227 Table H.3. Default Normal Daily Mean Temperature (F)
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228 Table H.5. Default Average Precipitation Rate (inches/hour)
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229 Table H.7. Default Day-of-Week Factors for Passenger Cars Number Urban Rural 1 Sunday 0.87 1.01 2 Monday 0.98 0.95 3 Tuesday 0.98 0.91 4 Wednesday 1.00 0.93 5 Thursday 1.03 0.98 6 Friday 1.15 1.16 7 Saturday 0.99 1.05 Day of Week Weekend 0 0.016 0.016 0.024 0.022 0.016 0.021 0.023 0.023 0.028 1 0.011 0.010 0.013 0.012 0.009 0.014 0.015 0.014 0.023 2 0.009 0.006 0.007 0.007 0.004 0.010 0.008 0.010 0.021 3 0.007 0.005 0.005 0.005 0.002 0.006 0.005 0.006 0.008 4 0.007 0.005 0.005 0.004 0.002 0.006 0.005 0.006 0.005 5 0.010 0.009 0.008 0.006 0.002 0.010 0.009 0.010 0.005 6 0.017 0.016 0.016 0.010 0.007 0.017 0.016 0.017 0.011 7 0.027 0.025 0.025 0.018 0.014 0.025 0.023 0.024 0.018 8 0.039 0.036 0.033 0.028 0.025 0.035 0.036 0.035 0.030 9 0.052 0.050 0.045 0.039 0.046 0.047 0.045 0.046 0.048 10 0.063 0.062 0.055 0.049 0.058 0.057 0.057 0.056 0.054 11 0.070 0.070 0.063 0.060 0.063 0.065 0.066 0.054 0.057 12 0.072 0.075 0.072 0.068 0.086 0.072 0.076 0.071 0.074 13 0.072 0.075 0.073 0.071 0.081 0.072 0.073 0.071 0.071 14 0.073 0.075 0.072 0.073 0.077 0.071 0.074 0.072 0.069 15 0.075 0.077 0.082 0.074 0.077 0.073 0.075 0.073 0.067 16 0.075 0.078 0.075 0.079 0.086 0.073 0.075 0.073 0.071 17 0.071 0.075 0.074 0.080 0.086 0.072 0.071 0.073 0.068 18 0.061 0.065 0.067 0.075 0.067 0.064 0.063 0.063 0.067 19 0.051 0.051 0.054 0.063 0.056 0.052 0.051 0.052 0.056 20 0.041 0.041 0.043 0.052 0.051 0.043 0.043 0.044 0.049 21 0.033 0.033 0.035 0.045 0.039 0.038 0.037 0.038 0.040 22 0.026 0.026 0.029 0.034 0.032 0.032 0.032 0.033 0.035 23 0.019 0.019 0.024 0.025 0.019 0.025 0.023 0.026 0.024 Functional Class Category Hour 1 2 6 7 8 11 12 14 16 Table H.6.
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230 incidents were identified for which weather conditions were reported. The distribution of incident type by weather condition indicated that, for any given incident type, the proportion varied less than 0.01 among weather conditions.
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231 the detection time varies from 1 to 2 min. A default value of 2.0 min is used in the reliability methodology described in this paper.
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232 Dowling, R., A Skabardonis, M
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