ATSSA TRAFFIC CONTROL SUPERVISOR RE-CERTIFICATION (MISSING SOME BASICS) TEST
QUESTIONS ANSWERED CORRECTLY LATEST 2025
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - 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 - Answers speed used in formulas should be
125' - Answers Distance of L for 25 MPH with 12' Lane width
245' - Answers Distance of L for 35 MPH with 12' Lane width
540' - Answers Distance of L for 45 MPH with 12' Lane width
660' - Answers Distance of L for 55 MPH with 12' Lane width
780' - Answers Distance of L for 65 MPH 12' Lane width
L Minimum - Answers Merging Taper Length
1/2 L Minimum - Answers Shifting Taper Length
1/3 L Minimum - Answers Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - Answers One-Lane, Two-Way Taper (Flagger taper) Length and number
of devices
50'-100' per lane - Answers Downstream taper Length
2L - Answers Tangent distance (between tapers)
1/2L - Answers Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - 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 - 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
May contain:
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane - Answers Termination Area is:
can contain: (2)
100' - Answers Recommended Advanced Warning Sign Spaceing: Urban (low speed)
350' - Answers Recommended Advanced Warning Sign Spaceing: urban (high speed)
500' - Answers Recommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' - Answers Recommended Advanced Warning Sign Spaceing: freeways
and expressways (3)
1 Mile
50%
shoulder at beginning of taper if possible, if not, as close to beginning as possible inside taper. -
Answers Arrow board visibility distance by design:
night time dimming:
location:
taper: not to exceed distance in feet = to posted speed limit
tangent: distance = double posted speed limit - Answers device spacing taper:
tangent:
A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
QUESTIONS ANSWERED CORRECTLY LATEST 2025
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - 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 - Answers speed used in formulas should be
125' - Answers Distance of L for 25 MPH with 12' Lane width
245' - Answers Distance of L for 35 MPH with 12' Lane width
540' - Answers Distance of L for 45 MPH with 12' Lane width
660' - Answers Distance of L for 55 MPH with 12' Lane width
780' - Answers Distance of L for 65 MPH 12' Lane width
L Minimum - Answers Merging Taper Length
1/2 L Minimum - Answers Shifting Taper Length
1/3 L Minimum - Answers Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - Answers One-Lane, Two-Way Taper (Flagger taper) Length and number
of devices
50'-100' per lane - Answers Downstream taper Length
2L - Answers Tangent distance (between tapers)
1/2L - Answers Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - 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 - 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
May contain:
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane - Answers Termination Area is:
can contain: (2)
100' - Answers Recommended Advanced Warning Sign Spaceing: Urban (low speed)
350' - Answers Recommended Advanced Warning Sign Spaceing: urban (high speed)
500' - Answers Recommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' - Answers Recommended Advanced Warning Sign Spaceing: freeways
and expressways (3)
1 Mile
50%
shoulder at beginning of taper if possible, if not, as close to beginning as possible inside taper. -
Answers Arrow board visibility distance by design:
night time dimming:
location:
taper: not to exceed distance in feet = to posted speed limit
tangent: distance = double posted speed limit - Answers device spacing taper:
tangent:
A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
