ATSSA Traffic Control Supervisor Re-
certification actual exam
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more selected 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 selected answer 👀speed
used in formulas should be
125' selected answer 👀Distance of L for 25 MPH with 12' Lane width
245' selected answer 👀Distance of L for 35 MPH with 12' Lane width
540' selected answer 👀Distance of L for 45 MPH with 12' Lane width
660' selected answer 👀Distance of L for 55 MPH with 12' Lane width
780' selected answer 👀Distance of L for 65 MPH 12' Lane width
L Minimum selected answer 👀Merging Taper Length
1/2 L Minimum selected answer 👀Shifting Taper Length
1/3 L Minimum selected answer 👀Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart selected answer 👀One-Lane, Two-Way Taper (Flagger
taper) Length and number of devices
50'-100' per lane selected answer 👀Downstream taper Length
2L selected answer 👀Tangent distance (between tapers)
1/2L selected answer 👀Tangent distance before shifting taper
, Buffer Space
Work Space
Traffic Space selected 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 selected
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:
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane selected answer 👀Termination Area is:
can contain: (2)
100' selected answer 👀Recommended Advanced Warning Sign Spaceing: Urban
(low speed)
350' selected answer 👀Recommended Advanced Warning Sign Spaceing: urban
(high speed)
500' selected answer 👀Recommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' selected answer 👀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. selected answer 👀Arrow board visibility distance by design:
night time dimming:
certification actual exam
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more selected 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 selected answer 👀speed
used in formulas should be
125' selected answer 👀Distance of L for 25 MPH with 12' Lane width
245' selected answer 👀Distance of L for 35 MPH with 12' Lane width
540' selected answer 👀Distance of L for 45 MPH with 12' Lane width
660' selected answer 👀Distance of L for 55 MPH with 12' Lane width
780' selected answer 👀Distance of L for 65 MPH 12' Lane width
L Minimum selected answer 👀Merging Taper Length
1/2 L Minimum selected answer 👀Shifting Taper Length
1/3 L Minimum selected answer 👀Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart selected answer 👀One-Lane, Two-Way Taper (Flagger
taper) Length and number of devices
50'-100' per lane selected answer 👀Downstream taper Length
2L selected answer 👀Tangent distance (between tapers)
1/2L selected answer 👀Tangent distance before shifting taper
, Buffer Space
Work Space
Traffic Space selected 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 selected
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:
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane selected answer 👀Termination Area is:
can contain: (2)
100' selected answer 👀Recommended Advanced Warning Sign Spaceing: Urban
(low speed)
350' selected answer 👀Recommended Advanced Warning Sign Spaceing: urban
(high speed)
500' selected answer 👀Recommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' selected answer 👀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. selected answer 👀Arrow board visibility distance by design:
night time dimming:
