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ATSSA Traffic Control Supervisor Re-certification questions with correct answers
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ATSSA Traffic Control Supervisor Re-certification questions with correct answers
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ATSSA Traffic Control Supervisor Re-certification questions with correct
answers
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - -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 - -speed used in
formulas should be
-125' - -Distance of L for 25 MPH with 12' Lane width
-245' - -Distance of L for 35 MPH with 12' Lane width
-540' - -Distance of L for 45 MPH with 12' Lane width
-660' - -Distance of L for 55 MPH with 12' Lane width
-780' - -Distance of L for 65 MPH 12' Lane width
-L Minimum - -Merging Taper Length
-1/2 L Minimum - -Shifting Taper Length
-1/3 L Minimum - -Shoulder Taper Length
-50'-100' regardless of speed
6 devices 10'-20' apart - -One-Lane, Two-Way Taper (Flagger taper) Length
and number of devices
-50'-100' per lane - -Downstream taper Length
-2L - -Tangent distance (between tapers)
-1/2L - -Tangent distance before shifting taper
-Buffer Space
Work Space
Traffic Space - -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 - -
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 - -Termination Area is:
can contain: (2)
-100' - -Recommended Advanced Warning Sign Spaceing: Urban (low
speed)
-350' - -Recommended Advanced Warning Sign Spaceing: urban (high
speed)
-500' - -Recommended Advanced Warning Sign Spaceing: Rural
-1000', 1500', and 2640' - -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. - -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 - -device spacing taper:
tangent:
-A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn - -Warning lights types:
Type A:
Type B:
Type C:
Type D:
-Uses for portable changeable message sign PCMS - -speed drops
significant delays
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