CAE419_Midterm_exam 2_Fall-2016-Formula sheet.docx

CAE419_Midterm_exam 2_Fall-2016-Formula sheet.docx - CAE419...

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CAE419 Exam 2 Formula Sheet Freeway Capacity Analysis Free flow speed: FFS = BFFS – F LW – F LC – F N - F ID (mph) Flow rate: Peak hour factor: Heavy vehicle adjustment: Webster Method for Fixed-Timing Signal Plan Step 1: Select a phase plan: 2, 3, or 4 phases Step 2: Convert volumes to through vehicle equivalents: Step 3: Determine critical lane volumes and flow ratios: Step 4: Calculate intergreen time: I i = Y i + AR (yellow + all red) ( ) ( ) exists traffic pedestrian if ), V L + W , V L + P max( + gG + a 2 V + t V L + W + gG + a 2 V + t = Time Red - All + Time Yellow = I p p min % approach, of Grade = G ft/sec 32.2 gravity, to due on Accelerati = g ft/sec vehicles, of rate on decelerati Constant = a ft vehicle, of Length = L ft crosswalk, g conflictin the of side far on the clear is rear vehicle until line STOP departure the form Distance = P ft lane, traffic g conflictin the of side far on the clear is rear vehicle until line STOP departure the form Distance = W ft/sec speed, Vehicle = V sec 2.5 - 1 time, /reaction perception Driver = t sec time, intergreen Minimum = I where 2

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• Spring '14
• ZongzhiLi

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