ATSSA Traffic Control Supervisor Re-certification Test with
Answers Graded A
L=(WS²)/60 for 40MPH or less, 1/2 L Minimum - ANSWER -Shifting Taper
L=WS for 45MPH or more - ANSWER - Length
Formula for Min. taper length
1/3 L Minimum - ANSWER -Shoulder Taper
The off peak 85th percentile. Which is the speed Length
at or below which 85% of vehicles travel
operating speed in free flow conditions -
ANSWER -speed used in formulas should
be 50'-100' regardless of speed
6 devices 10'-20' apart - ANSWER -One-
Lane, Two-Way Taper (Flagger taper) Length
and number of devices
125' - ANSWER -Distance of L for 25 MPH
with 12' Lane width
50'-100' per lane - ANSWER -Downstream
taper Length
245' - ANSWER -Distance of L for 35 MPH
with 12' Lane width
2L - ANSWER -Tangent distance (between
tapers)
540' - ANSWER -Distance of L for 45 MPH
with 12' Lane width
1/2L - ANSWER -Tangent distance before
shifting taper
660' - ANSWER -Distance of L for 55 MPH
with 12' Lane width
Buffer Space
Work Space
780' - ANSWER -Distance of L for 65 MPH Traffic Space - ANSWER -Activity Area
12' Lane width Sub-components (3)
L Minimum - ANSWER -Merging Taper Recovery Area for errant vehicles: Forgiving
Length design
Protects workers and Motorists
Always completely empty or clear
No vehicles, truck-mounted attenuator,
1/5
, ATSSA Traffic Control Supervisor Re-certification Test with
Answers Graded A
equipment, or materials shoulder at beginning of taper if possible, if not,
STRONGLY RECOMMENDED: unless there is a as close to beginning as possible inside taper. -
documented reason not to - ANSWER - ANSWER -Arrow board visibility distance by
Longitudinal Buffer Space design:
night time dimming:
location:
Where road users are returned to their normal
path
extends from the downstream end of the work taper: not to exceed distance in feet = to posted
area to the last device such as end work zone speed limit
sign tangent: distance = double posted speed limit -
May contain: ANSWER -device spacing taper:
end work zone sign: usually 500' past last device tangent:
downstream taper = 50'-100' per lane -
ANSWER -Termination Area is:
can contain: (2) A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn - ANSWER -Warning
100' - ANSWER -Recommended Advanced lights types:
Warning Sign Spaceing: Urban (low speed) Type A:
Type B:
Type C:
Type D:
350' - ANSWER -Recommended Advanced
Warning Sign Spaceing: urban (high speed)
Uses for portable changeable message sign
PCMS - ANSWER -speed drops
500' - ANSWER -Recommended Advanced significant delays
Warning Sign Spaceing: Rural adverse conditions
advance notice of closures
advance notice of road changes
reinforce static signage
1000', 1500', and 2640' - ANSWER - updated guidance information
Recommended Advanced Warning Sign placed 500'-800' ahead of workzone conflicts or
Spaceing: freeways and expressways (3) 1.5-2 miles ahead of complex traffic control
1 Mile uses of screens (mounted on top of rail) -
50% ANSWER -limit distractions and discourage
2/5
Answers Graded A
L=(WS²)/60 for 40MPH or less, 1/2 L Minimum - ANSWER -Shifting Taper
L=WS for 45MPH or more - ANSWER - Length
Formula for Min. taper length
1/3 L Minimum - ANSWER -Shoulder Taper
The off peak 85th percentile. Which is the speed Length
at or below which 85% of vehicles travel
operating speed in free flow conditions -
ANSWER -speed used in formulas should
be 50'-100' regardless of speed
6 devices 10'-20' apart - ANSWER -One-
Lane, Two-Way Taper (Flagger taper) Length
and number of devices
125' - ANSWER -Distance of L for 25 MPH
with 12' Lane width
50'-100' per lane - ANSWER -Downstream
taper Length
245' - ANSWER -Distance of L for 35 MPH
with 12' Lane width
2L - ANSWER -Tangent distance (between
tapers)
540' - ANSWER -Distance of L for 45 MPH
with 12' Lane width
1/2L - ANSWER -Tangent distance before
shifting taper
660' - ANSWER -Distance of L for 55 MPH
with 12' Lane width
Buffer Space
Work Space
780' - ANSWER -Distance of L for 65 MPH Traffic Space - ANSWER -Activity Area
12' Lane width Sub-components (3)
L Minimum - ANSWER -Merging Taper Recovery Area for errant vehicles: Forgiving
Length design
Protects workers and Motorists
Always completely empty or clear
No vehicles, truck-mounted attenuator,
1/5
, ATSSA Traffic Control Supervisor Re-certification Test with
Answers Graded A
equipment, or materials shoulder at beginning of taper if possible, if not,
STRONGLY RECOMMENDED: unless there is a as close to beginning as possible inside taper. -
documented reason not to - ANSWER - ANSWER -Arrow board visibility distance by
Longitudinal Buffer Space design:
night time dimming:
location:
Where road users are returned to their normal
path
extends from the downstream end of the work taper: not to exceed distance in feet = to posted
area to the last device such as end work zone speed limit
sign tangent: distance = double posted speed limit -
May contain: ANSWER -device spacing taper:
end work zone sign: usually 500' past last device tangent:
downstream taper = 50'-100' per lane -
ANSWER -Termination Area is:
can contain: (2) A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn - ANSWER -Warning
100' - ANSWER -Recommended Advanced lights types:
Warning Sign Spaceing: Urban (low speed) Type A:
Type B:
Type C:
Type D:
350' - ANSWER -Recommended Advanced
Warning Sign Spaceing: urban (high speed)
Uses for portable changeable message sign
PCMS - ANSWER -speed drops
500' - ANSWER -Recommended Advanced significant delays
Warning Sign Spaceing: Rural adverse conditions
advance notice of closures
advance notice of road changes
reinforce static signage
1000', 1500', and 2640' - ANSWER - updated guidance information
Recommended Advanced Warning Sign placed 500'-800' ahead of workzone conflicts or
Spaceing: freeways and expressways (3) 1.5-2 miles ahead of complex traffic control
1 Mile uses of screens (mounted on top of rail) -
50% ANSWER -limit distractions and discourage
2/5
