ATSSA Traffic Control Supervisor "The Typical Project"
Module 7 EXAM QUESTIONS WITH COMPLETE
SOLUTION GUIDE (A+ GRADED 100% VERIFIED)
LATEST VERSION 2025!!
Terms in this set (53)
L=(WS²)/60 for 40MPH Formula for Min. taper length
or less, L=WS for
45MPH or more
The off peak 85th percentile. speed used in formulas should be
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 One-Lane, Two-Way Taper (Flagger taper) Length and number of devices
of speed 6 devices
10'-20' apart
50'-100' per lane Downstream taper Length
2L Tangent distance (between tapers)
1/2L Tangent distance before shifting taper
, Buffer Activity Area Sub-components (3)
Space
Work
Space
Traffic
Space
Recovery Area for errant Longitudinal Buffer Space
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
Where road users are returned Termination
to their normal path
extends from the downstream Area is: can
end of the work area to the last
device such as end work zone contain: (2)
sign
May contain:
end work zone sign: usually 500'
past last device
downstream taper = 50'-100' per
lane
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 Arrow board visibility distance
50% by design: night time dimming:
shoulder at beginning of taper if location:
possible, if not, as close to
beginning as possible inside
Module 7 EXAM QUESTIONS WITH COMPLETE
SOLUTION GUIDE (A+ GRADED 100% VERIFIED)
LATEST VERSION 2025!!
Terms in this set (53)
L=(WS²)/60 for 40MPH Formula for Min. taper length
or less, L=WS for
45MPH or more
The off peak 85th percentile. speed used in formulas should be
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 One-Lane, Two-Way Taper (Flagger taper) Length and number of devices
of speed 6 devices
10'-20' apart
50'-100' per lane Downstream taper Length
2L Tangent distance (between tapers)
1/2L Tangent distance before shifting taper
, Buffer Activity Area Sub-components (3)
Space
Work
Space
Traffic
Space
Recovery Area for errant Longitudinal Buffer Space
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
Where road users are returned Termination
to their normal path
extends from the downstream Area is: can
end of the work area to the last
device such as end work zone contain: (2)
sign
May contain:
end work zone sign: usually 500'
past last device
downstream taper = 50'-100' per
lane
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 Arrow board visibility distance
50% by design: night time dimming:
shoulder at beginning of taper if location:
possible, if not, as close to
beginning as possible inside
