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ATSSA TRAFFIC CONTRO L
SUPERVISOR RE-CERTIFICATION
| QUESTIONS AND CORRECT
SOLUTIONS | LATEST UPDATE |
GRADED A+
Question : Formula for Min. taper length
CORRECT ANSWER : L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more
Question : speed used in formulas should be
CORRECT ANSWER : The off peak 85th percentile.
Which is the speed at or below which 85% of vehicles travel operating speed in free flow conditions
Question : Distance of L for 25 MPH with 12' Lane width
CORRECT ANSWER : 125'
Question : Distance of L for 35 MPH with 12' Lane width
CORRECT ANSWER : 245'
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Question : Distance of L for 45 MPH with 12' Lane width
CORRECT ANSWER : 540'
Question : Distance of L for 55 MPH with 12' Lane width
CORRECT ANSWER : 660'
Question : Distance of L for 65 MPH 12' Lane width
CORRECT ANSWER : 780'
Question : Merging Taper Length
CORRECT ANSWER : L Minimum
Question : Shifting Taper Length
CORRECT ANSWER : 1/2 L Minimum
Question : Shoulder Taper Length
CORRECT ANSWER : 1/3 L Minimum
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Question : One-Lane, Two-Way Taper (Flagger taper)
Length and number of devices
CORRECT ANSWER : 50'-100' regardless of speed
- devices 10'-20' apart
Question : Downstream taper Length
CORRECT ANSWER : 50'-100' per lane
Question : Tangent distance (between tapers)
CORRECT ANSWER : 2L
Question : Tangent distance before shifting taper
CORRECT ANSWER : 1/2L
Question : Activity Area Sub-components (3)
CORRECT ANSWER : Buffer Space
Work Space Traffic Space
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Question : Longitudinal Buffer Space
CORRECT ANSWER : 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
Question : Termination Area is:
can contain: (2)
CORRECT ANSWER : 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