ATSSA Traffic Control Supervisor Re-certification 2026/ 2027 Complete Questions and Answers with Solution

ATSSA Traffic Control
Supervisor Re-certification
(missing some basics)

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Terms in this set (53)

,L=(WS²)/60 for Formula for Min. taper length
40MPH or less,
L=WS for 45MPH or
more

The off peak 85th speed used in formulas should be
percentile. Which is
the speed at or
below which 85% of
vehicles travel
operating speed in
free flow conditions




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 One-Lane, Two-Way Taper (Flagger taper)
speed Length and number of devices
6 devices 10'-20'
apart

50'-100' per lane Downstream taper Length

2L Tangent distance (between tapers)