COMPLETE QUESTIONS AND SOLUTIONS
GRADED A+
◉The off peak 85th percentile. Which is the speed at or below which
85% of vehicles travel operating speed in free flow conditions.
Answer: speed used in formulas should be
◉125'. Answer: Distance of L for 25 MPH with 12' Lane width
◉245'. Answer: Distance of L for 35 MPH with 12' Lane width
◉540'. Answer: Distance of L for 45 MPH with 12' Lane width
◉660'. Answer: Distance of L for 55 MPH with 12' Lane width
◉780'. Answer: Distance of L for 65 MPH 12' Lane width
◉L Minimum. Answer: Merging Taper Length
, ◉1/2 L Minimum. Answer: Shifting Taper Length
◉1/3 L Minimum. Answer: Shoulder Taper Length
◉50'-100' regardless of speed
6 devices 10'-20' apart. Answer: One-Lane, Two-Way Taper (Flagger
taper) Length and number of devices
◉50'-100' per lane. Answer: Downstream taper Length
◉2L. Answer: Tangent distance (between tapers)
◉1/2L. Answer: Tangent distance before shifting taper
◉Buffer Space
Work Space
Traffic Space. Answer: Activity 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