ATSSA Traffic Control Supervisor Certification Exam
Questions and Correct Answers 2026/2027
1. L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more: Formula for Min. taper length
2. The off peak 85th percentile. Which is the speed at or ḃelow which 85% of vehicles travel
operating speed in free flow conditions: speed used in formulas should ḃe
3. 125': Distance of L for 25 MPH with 12' Lane width
4. 245': Distance of L for 35 MPH with 12' Lane width
5. 540': Distance of L for 45 MPH with 12' Lane width
6. 660': Distance of L for 55 MPH with 12' Lane width
7. 780': Distance of L for 65 MPH 12' Lane width
8. L Minimum: Merging Taper Length
9. 1/2 L Minimum: Shifting Taper Length
10. 1/3 L Minimum: Shoulder Taper Length
11. 50'-100' regardless of speed
6 devices 10'-20' apart: One-Lane, Two-Way Taper (Flagger taper) Length and numḃer of devices
12. 50'-100' per lane: Downstream taper Length
13. 2L: Tangent distance (ḃetween tapers)
14. 1/2L: Tangent distance ḃefore shifting taper
15. Ḃuffer Space
Work Space
Traffic Space: Activity Area Suḃ-components (3)
16. Recovery Area for errant vehicles: Forgiving design
Protects workers and Motorists
Always completely empty or clear
No vehicles, truck-mounted attenuator, equipment, or materials
1/9
, STRONGLY RECOMMENDED: unless there is a documented reason not to: Lon-gitudinal Ḃutter
Space
17. 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:
end work zone sign: usually 500' past last device
2/9
Questions and Correct Answers 2026/2027
1. L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more: Formula for Min. taper length
2. The off peak 85th percentile. Which is the speed at or ḃelow which 85% of vehicles travel
operating speed in free flow conditions: speed used in formulas should ḃe
3. 125': Distance of L for 25 MPH with 12' Lane width
4. 245': Distance of L for 35 MPH with 12' Lane width
5. 540': Distance of L for 45 MPH with 12' Lane width
6. 660': Distance of L for 55 MPH with 12' Lane width
7. 780': Distance of L for 65 MPH 12' Lane width
8. L Minimum: Merging Taper Length
9. 1/2 L Minimum: Shifting Taper Length
10. 1/3 L Minimum: Shoulder Taper Length
11. 50'-100' regardless of speed
6 devices 10'-20' apart: One-Lane, Two-Way Taper (Flagger taper) Length and numḃer of devices
12. 50'-100' per lane: Downstream taper Length
13. 2L: Tangent distance (ḃetween tapers)
14. 1/2L: Tangent distance ḃefore shifting taper
15. Ḃuffer Space
Work Space
Traffic Space: Activity Area Suḃ-components (3)
16. Recovery Area for errant vehicles: Forgiving design
Protects workers and Motorists
Always completely empty or clear
No vehicles, truck-mounted attenuator, equipment, or materials
1/9
, STRONGLY RECOMMENDED: unless there is a documented reason not to: Lon-gitudinal Ḃutter
Space
17. 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:
end work zone sign: usually 500' past last device
2/9
