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ATSSA TRAFFIC CONTROL
SUPERVISOR RE-CERTIFICATION
QUESTIONS WITH COMPLETE
SOLUTIONS
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - correct answer-Formula 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 - correct answer-speed used in formulas should be
125' - correct answer-Distance of L for 25 MPH with 12' Lane
width
245' - correct answer-Distance of L for 35 MPH with 12' Lane
width
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540' - correct answer-Distance of L for 45 MPH with 12' Lane
width
660' - correct answer-Distance of L for 55 MPH with 12' Lane
width
780' - correct answer-Distance of L for 65 MPH 12' Lane width
L Minimum - correct answer-Merging Taper Length
1/2 L Minimum - correct answer-Shifting Taper Length
1/3 L Minimum - correct answer-Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - correct answer-One-Lane, Two-Way
Taper (Flagger taper) Length and number of devices
ATSSA TRAFFIC CONTROL
SUPERVISOR RE-CERTIFICATION
QUESTIONS WITH COMPLETE
SOLUTIONS
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - correct answer-Formula 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 - correct answer-speed used in formulas should be
125' - correct answer-Distance of L for 25 MPH with 12' Lane
width
245' - correct answer-Distance of L for 35 MPH with 12' Lane
width
, Page | 2
540' - correct answer-Distance of L for 45 MPH with 12' Lane
width
660' - correct answer-Distance of L for 55 MPH with 12' Lane
width
780' - correct answer-Distance of L for 65 MPH 12' Lane width
L Minimum - correct answer-Merging Taper Length
1/2 L Minimum - correct answer-Shifting Taper Length
1/3 L Minimum - correct answer-Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - correct answer-One-Lane, Two-Way
Taper (Flagger taper) Length and number of devices
