ATTSA TRAFFIC SUPERVISOR CERTIFICATION EXAM QUESTIONS AND CORRECT ANSWERS

ATTSA TRAFFIC SUPERVISOR CERTIFICATION EXAM QUESTIONS AND CORRECT ANSWERS L=(WS²)/60 for 40MPH or less, L=WS for 45MPH or more - AnswerFormula for Min. taper length The off peak 85th percentile. Which is the speed at or below which 85% of vehicles travel operating speed in free flow conditions - Answerspeed used in formulas should be 125' - AnswerDistance of L for 25 MPH with 12' Lane width 245' - AnswerDistance of L for 35 MPH with 12' Lane width 540' - AnswerDistance of L for 45 MPH with 12' Lane width 660' - AnswerDistance of L for 55 MPH with 12' Lane width 780' - AnswerDistance of L for 65 MPH 12' Lane width L Minimum - AnswerMerging Taper Length 1/2 L Minimum - AnswerShifting Taper Length 1/3 L Minimum - AnswerShoulder Taper Length 50'-100' regardless of speed 6 devices 10'-20' apart - AnswerOne-Lane, Two-Way Taper (Flagger taper) Length and number of devices 50'-100' per lane - AnswerDownstream taper Length 2L - AnswerTangent distance (between tapers) 1/2L - AnswerTangent distance before shifting taper Buffer Space Work Space Traffic Space - AnswerActivity Area Sub-components (3) Recovery Area for errant vehicles: Forgiving design Protects workers and Motorists Always completely empty or clear No vehicles, truck-mounted attenuator, equipment, or materials STRONGLY RECOMMENDED: unless there is a documented reason not to - AnswerLongitudinal Buffer Space Where road users are returned to their normal path extends from the downstream end of the work area to the last device such as end work zone sign May contain: end work zone sign: usually 500' past last device downstream taper = 50'-100' per lane - AnswerTermination Area is: