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ATSSA TRAFFIC CONTRO L
SUPERVISOR RE-CERTIFICATION
TESTS ANSWERED CORRE CTLY!!
Question 1: The formula for minimum taper length is
given as L=(WS²)/60 for 40 MPH or less, and L=WS for 45 MPH or more. What is the speed used in these formulas based on?
CORRECT ANSWER: The off peak 85th percentile.
Which is the speed at or below which 85% of vehicles travel operating speed in free flow conditions.
Question 2: What is the distance of L for 25 MPH with a
12' lane width?
CORRECT ANSWER: 125'
Question 3: What is the distance of L for 35 MPH with a
12' lane width?
CORRECT ANSWER: 245'
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Question 4: What is the distance of L for 45 MPH with a
12' lane width?
CORRECT ANSWER: 540'
Question 5: What is the distance of L for 55 MPH with a
12' lane width?
CORRECT ANSWER: 660'
Question 6: What is the distance of L for 65 MPH with a
12' lane width?
CORRECT ANSWER: 780'
Question 7: What is the minimum merging taper length?
CORRECT ANSWER : L Minimum
Question 8: What is the minimum shifting taper length?
CORRECT ANSWER: 1/2 L Minimum
Question 9: What is the minimum shoulder taper length?
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CORRECT ANSWER: 1/3 L Minimum
Question 10: What is the length and number of devices
for a one-lane, two-way taper (flagger taper)?
CORRECT ANSWER: 50'-100' regardless of speed, 6
devices 10'-20' apart
Question 11: What is the downstream taper length?
CORRECT ANSWER: 50'-100' per lane
Question 12: What is the tangent distance between tapers?
CORRECT ANSWER: 2L
Question 13: What is the tangent distance before a
shifting taper?
CORRECT ANSWER: 1/2L
Question 14: What are the three sub-components of the
activity area?
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CORRECT ANSWER: Buffer Space, Work Space,
Traffic Space
Question 15: What are the characteristics and
recommendations for the longitudinal buffer space?
CORRECT ANSWER: 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
Question 16: What is the termination area, and what can it
contain?
CORRECT ANSWER: 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