ATSSA Traffic Control Supervisor Re-
certification 2024/2025 Exam Questions
and Detailed Answers | Get it 100%
Correct Answers
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - 🧠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 - 🧠ANSWER
✔✔speed used in formulas should be
125' - 🧠ANSWER ✔✔Distance of L for 25 MPH with 12' Lane width
245' - 🧠ANSWER ✔✔Distance of L for 35 MPH with 12' Lane width
540' - 🧠ANSWER ✔✔Distance of L for 45 MPH with 12' Lane width
660' - 🧠ANSWER ✔✔Distance of L for 55 MPH with 12' Lane width
780' - 🧠ANSWER ✔✔Distance of L for 65 MPH 12' Lane width
L Minimum - 🧠ANSWER ✔✔Merging Taper Length
1/2 L Minimum - 🧠ANSWER ✔✔Shifting Taper Length
1/3 L Minimum - 🧠ANSWER ✔✔Shoulder Taper Length
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
, 50'-100' regardless of speed
6 devices 10'-20' apart - 🧠ANSWER ✔✔One-Lane, Two-Way Taper
(Flagger taper) Length and number of devices
50'-100' per lane - 🧠ANSWER ✔✔Downstream taper Length
2L - 🧠ANSWER ✔✔Tangent distance (between tapers)
1/2L - 🧠ANSWER ✔✔Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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
May contain:
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
certification 2024/2025 Exam Questions
and Detailed Answers | Get it 100%
Correct Answers
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - 🧠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 - 🧠ANSWER
✔✔speed used in formulas should be
125' - 🧠ANSWER ✔✔Distance of L for 25 MPH with 12' Lane width
245' - 🧠ANSWER ✔✔Distance of L for 35 MPH with 12' Lane width
540' - 🧠ANSWER ✔✔Distance of L for 45 MPH with 12' Lane width
660' - 🧠ANSWER ✔✔Distance of L for 55 MPH with 12' Lane width
780' - 🧠ANSWER ✔✔Distance of L for 65 MPH 12' Lane width
L Minimum - 🧠ANSWER ✔✔Merging Taper Length
1/2 L Minimum - 🧠ANSWER ✔✔Shifting Taper Length
1/3 L Minimum - 🧠ANSWER ✔✔Shoulder Taper Length
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
, 50'-100' regardless of speed
6 devices 10'-20' apart - 🧠ANSWER ✔✔One-Lane, Two-Way Taper
(Flagger taper) Length and number of devices
50'-100' per lane - 🧠ANSWER ✔✔Downstream taper Length
2L - 🧠ANSWER ✔✔Tangent distance (between tapers)
1/2L - 🧠ANSWER ✔✔Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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
May contain:
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
