ATSSA TRAFFIC CONTROL SUPERVISOR RE-
CERTIFICATION ACTUAL 2025/2026 QUESTIONS
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Terms in this set (53)
Formula for Min. taper length L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more
speed used in formulas should be The off peak 85th percentile. Which is the speed at
or below which 85% of vehicles travel operating
speed in free flow conditions
Distance of L for 25 MPH with 12' 125'
Lane width
Distance of L for 35 MPH with 12' 245'
Lane width
Distance of L for 45 MPH with 12' 540'
Lane width
Distance of L for 55 MPH with 12' 660'
Lane width
, Distance of L for 65 MPH 12' Lane 780'
width
Merging Taper Length L Minimum
Shifting Taper Length 1/2 L Minimum
Shoulder Taper Length 1/3 L Minimum
One-Lane, Two-Way Taper (Flagger 50'-100' regardless of speed
taper) Length and number of devices 6 devices 10'-20' apart
Downstream taper Length 50'-100' per lane
Tangent distance (between tapers) 2L
Tangent distance before shifting 1/2L
taper
Activity Area Sub-components (3) Buffer Space
Work Space
Traffic Space
Longitudinal Buffer Space 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
CERTIFICATION ACTUAL 2025/2026 QUESTIONS
AND 100% CORRECT ANSWERS
Save
Terms in this set (53)
Formula for Min. taper length L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more
speed used in formulas should be The off peak 85th percentile. Which is the speed at
or below which 85% of vehicles travel operating
speed in free flow conditions
Distance of L for 25 MPH with 12' 125'
Lane width
Distance of L for 35 MPH with 12' 245'
Lane width
Distance of L for 45 MPH with 12' 540'
Lane width
Distance of L for 55 MPH with 12' 660'
Lane width
, Distance of L for 65 MPH 12' Lane 780'
width
Merging Taper Length L Minimum
Shifting Taper Length 1/2 L Minimum
Shoulder Taper Length 1/3 L Minimum
One-Lane, Two-Way Taper (Flagger 50'-100' regardless of speed
taper) Length and number of devices 6 devices 10'-20' apart
Downstream taper Length 50'-100' per lane
Tangent distance (between tapers) 2L
Tangent distance before shifting 1/2L
taper
Activity Area Sub-components (3) Buffer Space
Work Space
Traffic Space
Longitudinal Buffer Space 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
