ATSSA Traffic Control Supervisor Re-certification
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Terms in this set (53)
Formula for Min. taper L=(WS²)/60 for 40MPH or less,
length L=WS for 45MPH or more
The off peak 85th percentile. Which is the speed at or
speed used in formulas
below which 85% of vehicles travel operating speed in
should be
free flow conditions
Distance of L for 25 MPH 125'
with 12' Lane width
Distance of L for 35 MPH 245'
with 12' Lane width
Distance of L for 45 MPH 540'
with 12' Lane width
Distance of L for 55 MPH 660'
with 12' Lane width
Distance of L for 65 MPH 780'
12' Lane width
Merging Taper Length L Minimum
Shifting Taper Length 1/2 L Minimum
Shoulder Taper Length 1/3 L Minimum
, One-Lane, Two-Way Taper 50'-100' regardless of speed
(Flagger taper) Length 6 devices 10'-20' apart
and number of devices
Downstream taper Length 50'-100' per lane
Tangent distance 2L
(between tapers)
Tangent distance before 1/2L
shifting taper
Buffer Space
Activity Area Sub-
Work Space
components (3)
Traffic Space
Recovery Area for errant vehicles: Forgiving design
Protects workers and Motorists
Always completely empty or clear
Longitudinal Buffer Space No vehicles, truck-mounted attenuator, equipment, or
materials
STRONGLY RECOMMENDED: unless there is a
documented reason not to
Where road users are returned to their normal path
extends from the downstream end of the work area to
Termination Area is:
the last device such as end work zone sign
May contain:
can contain: (2)
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane
Recommended Advanced 100'
Warning Sign Spaceing:
Urban (low speed)
Recommended Advanced 350'
Warning Sign Spaceing:
urban (high speed)
Recommended Advanced 500'
Warning Sign Spaceing:
Rural
Exam Questions with 100% Correct Answers |
Verified | Latest Update 2025!!
Save
Terms in this set (53)
Formula for Min. taper L=(WS²)/60 for 40MPH or less,
length L=WS for 45MPH or more
The off peak 85th percentile. Which is the speed at or
speed used in formulas
below which 85% of vehicles travel operating speed in
should be
free flow conditions
Distance of L for 25 MPH 125'
with 12' Lane width
Distance of L for 35 MPH 245'
with 12' Lane width
Distance of L for 45 MPH 540'
with 12' Lane width
Distance of L for 55 MPH 660'
with 12' Lane width
Distance of L for 65 MPH 780'
12' Lane width
Merging Taper Length L Minimum
Shifting Taper Length 1/2 L Minimum
Shoulder Taper Length 1/3 L Minimum
, One-Lane, Two-Way Taper 50'-100' regardless of speed
(Flagger taper) Length 6 devices 10'-20' apart
and number of devices
Downstream taper Length 50'-100' per lane
Tangent distance 2L
(between tapers)
Tangent distance before 1/2L
shifting taper
Buffer Space
Activity Area Sub-
Work Space
components (3)
Traffic Space
Recovery Area for errant vehicles: Forgiving design
Protects workers and Motorists
Always completely empty or clear
Longitudinal Buffer Space No vehicles, truck-mounted attenuator, equipment, or
materials
STRONGLY RECOMMENDED: unless there is a
documented reason not to
Where road users are returned to their normal path
extends from the downstream end of the work area to
Termination Area is:
the last device such as end work zone sign
May contain:
can contain: (2)
end work zone sign: usually 500' past last device
downstream taper = 50'-100' per lane
Recommended Advanced 100'
Warning Sign Spaceing:
Urban (low speed)
Recommended Advanced 350'
Warning Sign Spaceing:
urban (high speed)
Recommended Advanced 500'
Warning Sign Spaceing:
Rural
