ATSSA TRAFFIC CONTROL
SUPERVISOR RE-CERTIFICATION
ACTUAL EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - ANS 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 - ANS speed used in formulas should be
125' - ANS Distance of L for 25 MPH with 12' Lane width
245' - ANS Distance of L for 35 MPH with 12' Lane width
540' - ANS Distance of L for 45 MPH with 12' Lane width
660' - ANS Distance of L for 55 MPH with 12' Lane width
780' - ANS Distance of L for 65 MPH 12' Lane width
L Minimum - ANS Merging Taper Length
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 7
, 1/2 L Minimum - ANS Shifting Taper Length
1/3 L Minimum - ANS Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - ANS One-Lane, Two-Way Taper (Flagger taper) Length and number
of devices
50'-100' per lane - ANS Downstream taper Length
2L - ANS Tangent distance (between tapers)
1/2L - ANS Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - ANS 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
STRONGLY RECOMMENDED: unless there is a documented reason not to - ANS Longitudinal
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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 7
SUPERVISOR RE-CERTIFICATION
ACTUAL EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - ANS 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 - ANS speed used in formulas should be
125' - ANS Distance of L for 25 MPH with 12' Lane width
245' - ANS Distance of L for 35 MPH with 12' Lane width
540' - ANS Distance of L for 45 MPH with 12' Lane width
660' - ANS Distance of L for 55 MPH with 12' Lane width
780' - ANS Distance of L for 65 MPH 12' Lane width
L Minimum - ANS Merging Taper Length
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 7
, 1/2 L Minimum - ANS Shifting Taper Length
1/3 L Minimum - ANS Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - ANS One-Lane, Two-Way Taper (Flagger taper) Length and number
of devices
50'-100' per lane - ANS Downstream taper Length
2L - ANS Tangent distance (between tapers)
1/2L - ANS Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - ANS 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
STRONGLY RECOMMENDED: unless there is a documented reason not to - ANS Longitudinal
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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 7
