ATSSA Traffic Control Supervisor Re-Certification (Missing Some
Basics) – 2025/2026 Updated Exam Prep & Study Guide | 100% Pass
Guarantee
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - correct answerFormula 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 answerspeed used in formulas
should be
125' - correct answerDistance of L for 25 MPH with 12' Lane width
245' - correct answerDistance of L for 35 MPH with 12' Lane width
540' - correct answerDistance of L for 45 MPH with 12' Lane width
660' - correct answerDistance of L for 55 MPH with 12' Lane width
780' - correct answerDistance of L for 65 MPH 12' Lane width
L Minimum - correct answerMerging Taper Length
1/2 L Minimum - correct answerShifting Taper Length
1/3 L Minimum - correct answerShoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - correct answerOne-Lane, Two-Way Taper (Flagger taper)
Length and number of devices
50'-100' per lane - correct answerDownstream taper Length
2L - correct answerTangent distance (between tapers)
1/2L - correct answerTangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - correct answerActivity 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
answerLongitudinal 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 - correct answerTermination Area is:
can contain: (2)
100' - correct answerRecommended Advanced Warning Sign Spaceing: Urban (low
speed)
350' - correct answerRecommended Advanced Warning Sign Spaceing: urban (high
speed)
500' - correct answerRecommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' - correct answerRecommended 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. - correct answerArrow 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 - correct answerdevice spacing taper:
tangent:
A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn - correct answerWarning lights types:
Type A:
Type B:
Type C:
Type D:
Uses for portable changeable message sign PCMS - correct answerspeed drops
Basics) – 2025/2026 Updated Exam Prep & Study Guide | 100% Pass
Guarantee
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - correct answerFormula 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 answerspeed used in formulas
should be
125' - correct answerDistance of L for 25 MPH with 12' Lane width
245' - correct answerDistance of L for 35 MPH with 12' Lane width
540' - correct answerDistance of L for 45 MPH with 12' Lane width
660' - correct answerDistance of L for 55 MPH with 12' Lane width
780' - correct answerDistance of L for 65 MPH 12' Lane width
L Minimum - correct answerMerging Taper Length
1/2 L Minimum - correct answerShifting Taper Length
1/3 L Minimum - correct answerShoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - correct answerOne-Lane, Two-Way Taper (Flagger taper)
Length and number of devices
50'-100' per lane - correct answerDownstream taper Length
2L - correct answerTangent distance (between tapers)
1/2L - correct answerTangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - correct answerActivity 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
answerLongitudinal 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 - correct answerTermination Area is:
can contain: (2)
100' - correct answerRecommended Advanced Warning Sign Spaceing: Urban (low
speed)
350' - correct answerRecommended Advanced Warning Sign Spaceing: urban (high
speed)
500' - correct answerRecommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' - correct answerRecommended 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. - correct answerArrow 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 - correct answerdevice spacing taper:
tangent:
A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn - correct answerWarning lights types:
Type A:
Type B:
Type C:
Type D:
Uses for portable changeable message sign PCMS - correct answerspeed drops
