ATSSA Traffic Control Supervisor Recertification Study Guide
2026–2027 | Complete Exam Questions, Answers & Renewal Prep
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - correct answers -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 answers -speed used in formulas should be
125' - correct answers -Distance of L for 25 MPH with 12' Lane width
245' - correct answers -Distance of L for 35 MPH with 12' Lane width
540' - correct answers -Distance of L for 45 MPH with 12' Lane width
660' - correct answers -Distance of L for 55 MPH with 12' Lane width
780' - correct answers -Distance of L for 65 MPH 12' Lane width
L Minimum - correct answers -Merging Taper Length
1/2 L Minimum - correct answers -Shifting Taper Length
1/3 L Minimum - correct answers -Shoulder Taper Length
1
, 50'-100' regardless of speed
6 devices 10'-20' apart - correct answers -One-Lane, Two-Way Taper (Flagger taper) Length and number
of devices
50'-100' per lane - correct answers -Downstream taper Length
2L - correct answers -Tangent distance (between tapers)
1/2L - correct answers -Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - correct answers -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 - correct answers -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
2
2026–2027 | Complete Exam Questions, Answers & Renewal Prep
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - correct answers -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 answers -speed used in formulas should be
125' - correct answers -Distance of L for 25 MPH with 12' Lane width
245' - correct answers -Distance of L for 35 MPH with 12' Lane width
540' - correct answers -Distance of L for 45 MPH with 12' Lane width
660' - correct answers -Distance of L for 55 MPH with 12' Lane width
780' - correct answers -Distance of L for 65 MPH 12' Lane width
L Minimum - correct answers -Merging Taper Length
1/2 L Minimum - correct answers -Shifting Taper Length
1/3 L Minimum - correct answers -Shoulder Taper Length
1
, 50'-100' regardless of speed
6 devices 10'-20' apart - correct answers -One-Lane, Two-Way Taper (Flagger taper) Length and number
of devices
50'-100' per lane - correct answers -Downstream taper Length
2L - correct answers -Tangent distance (between tapers)
1/2L - correct answers -Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - correct answers -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 - correct answers -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
2
