ATSSA
ATSSA Traffic Control Supervisor Re-Certification
Exam Questions with Correct Answers 100%
Solved 2026
Formula for Min. taper length -Correct Answer ✔-L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more
speed used in formulas should be -Correct Answer ✔-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' Lane width -Correct Answer ✔-125'
Distance of L for 35 MPH with 12' Lane width -Correct Answer ✔-245'
Distance of L for 45 MPH with 12' Lane width -Correct Answer ✔-540'
Distance of L for 55 MPH with 12' Lane width -Correct Answer ✔-660'
Distance of L for 65 MPH 12' Lane width -Correct Answer ✔-780'
Merging Taper Length -Correct Answer ✔-L Minimum
Shifting Taper Length -Correct Answer ✔-1/2 L Minimum
Shoulder Taper Length -Correct Answer ✔-1/3 L Minimum
One-Lane, Two-Way Taper (Flagger taper) Length and number of devices -Correct
Answer ✔-50'-100' regardless of speed
6 devices 10'-20' apart
Downstream taper Length -Correct Answer ✔-50'-100' per lane
Tangent distance (between tapers) -Correct Answer ✔-2L
Tangent distance before shifting taper -Correct Answer ✔-1/2L
Activity Area Sub-components (3) -Correct Answer ✔-Buffer Space
Work Space
Traffic Space
ATSSA
, ATSSA
Longitudinal Buffer Space -Correct Answer ✔-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
Termination Area is:
can contain: (2) -Correct Answer ✔-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
downstream taper = 50'-100' per lane
Recommended Advanced Warning Sign Spaceing: Urban (low speed) -Correct Answer
✔-100'
Recommended Advanced Warning Sign Spaceing: urban (high speed) -Correct Answer
✔-350'
Recommended Advanced Warning Sign Spaceing: Rural -Correct Answer ✔-500'
Recommended Advanced Warning Sign Spaceing: freeways and expressways (3) -
Correct Answer ✔-1000', 1500', and 2640'
Arrow board visibility distance by design:
night time dimming:
location: -Correct Answer ✔-1 Mile
50%
shoulder at beginning of taper if possible, if not, as close to beginning as possible inside
taper.
device spacing taper:
tangent: -Correct Answer ✔-taper: not to exceed distance in feet = to posted speed limit
tangent: distance = double posted speed limit
Warning lights types:
Type A:
Type B:
Type C:
Type D: -Correct Answer ✔-A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
ATSSA
ATSSA Traffic Control Supervisor Re-Certification
Exam Questions with Correct Answers 100%
Solved 2026
Formula for Min. taper length -Correct Answer ✔-L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more
speed used in formulas should be -Correct Answer ✔-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' Lane width -Correct Answer ✔-125'
Distance of L for 35 MPH with 12' Lane width -Correct Answer ✔-245'
Distance of L for 45 MPH with 12' Lane width -Correct Answer ✔-540'
Distance of L for 55 MPH with 12' Lane width -Correct Answer ✔-660'
Distance of L for 65 MPH 12' Lane width -Correct Answer ✔-780'
Merging Taper Length -Correct Answer ✔-L Minimum
Shifting Taper Length -Correct Answer ✔-1/2 L Minimum
Shoulder Taper Length -Correct Answer ✔-1/3 L Minimum
One-Lane, Two-Way Taper (Flagger taper) Length and number of devices -Correct
Answer ✔-50'-100' regardless of speed
6 devices 10'-20' apart
Downstream taper Length -Correct Answer ✔-50'-100' per lane
Tangent distance (between tapers) -Correct Answer ✔-2L
Tangent distance before shifting taper -Correct Answer ✔-1/2L
Activity Area Sub-components (3) -Correct Answer ✔-Buffer Space
Work Space
Traffic Space
ATSSA
, ATSSA
Longitudinal Buffer Space -Correct Answer ✔-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
Termination Area is:
can contain: (2) -Correct Answer ✔-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
downstream taper = 50'-100' per lane
Recommended Advanced Warning Sign Spaceing: Urban (low speed) -Correct Answer
✔-100'
Recommended Advanced Warning Sign Spaceing: urban (high speed) -Correct Answer
✔-350'
Recommended Advanced Warning Sign Spaceing: Rural -Correct Answer ✔-500'
Recommended Advanced Warning Sign Spaceing: freeways and expressways (3) -
Correct Answer ✔-1000', 1500', and 2640'
Arrow board visibility distance by design:
night time dimming:
location: -Correct Answer ✔-1 Mile
50%
shoulder at beginning of taper if possible, if not, as close to beginning as possible inside
taper.
device spacing taper:
tangent: -Correct Answer ✔-taper: not to exceed distance in feet = to posted speed limit
tangent: distance = double posted speed limit
Warning lights types:
Type A:
Type B:
Type C:
Type D: -Correct Answer ✔-A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
ATSSA
