Calculate the free-flow speed for this section of freeway. [Solution Shown Below]
Solution When actual field measurements arent available, free-flow speed is estimated by the following equation, which utilizes the tables given in the Free-Flow Speed Adjustment theory and concept page: FFS = 70 fLW fLC fN - fID fLW = adjustment for lane width = 2.0 fLC = adjustment for right-shoulder lateral clearance = 1.6 fN = adjustment for number of lanes = 3.0 fID = adjustment for interchange density = 2.5 FSS = estimated free-flow speed = 70 2.0 1.6 3.0 2.5 = 60.9 mph
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