Incorporating Travel Time Reliability into the Highway Capacity Manual (2014) / Chapter Skim
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Pages 216-224
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216 This appendix presents recommended free-flow speed adjustment factors (SAFs) for weather.
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217 where S = segment speed (mph) ; FFS = segment free-flow speed (mph)
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218 Base Capacity (Clear, Dry) = Base capacity for dry pavement, fair weather, nonincident conditions (pc/h/ ln)
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219 the nature of works. Short-term work zone duration is more than an hour and within a single daylight period (Federal Highway Administration 2009)
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220 free-flow speed are assumed to apply to freeways with higher and lower free-flow speeds. In other words, the effect of the work zone on capacity is assumed to be proportional to the base capacity.
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221 This section summarizes past research efforts performed on work zone and speed and enforcement. Richards et al.
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222 in the upstream of one-lane, two-way work zones on rural highways. The evaluation was performed under three conditions during field experiments: PCMS switched on, PCMS switched off but still visible, and PCMS removed from the road and out of sight.
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223 the recommended free-flow SAFs equal or exceed the minimum values given in Exhibit 10-15 of the HCM2010. Rakha et al.
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224 Koetse, M
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