ATSSA Traffic Control Supervisor Re-certification
(missing some basics) Questions with correct Answers
2024/2025( A+ GRADED 100% VERIFIED).
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - ANSWER 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 - ANSWER speed used in formulas
should be
125' - ANSWER Distance of L for 25 MPH with 12' Lane width
245' - ANSWER Distance of L for 35 MPH with 12' Lane width
540' - ANSWER Distance of L for 45 MPH with 12' Lane width
660' - ANSWER Distance of L for 55 MPH with 12' Lane width
780' - ANSWER Distance of L for 65 MPH 12' Lane width
L Minimum - ANSWER Merging Taper Length
1/2 L Minimum - ANSWER Shifting Taper Length
1/3 L Minimum - ANSWER Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - ANSWER One-Lane, Two-Way Taper (Flagger taper)
Length and number of devices
50'-100' per lane - ANSWER Downstream taper Length
2L - ANSWER Tangent distance (between tapers)
1/2L - ANSWER Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - ANSWER 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 -
ANSWER Longitudinal Buffer Space
, ATSSA Traffic Control Supervisor Re-certification
(missing some basics) Questions with correct Answers
2024/2025( A+ GRADED 100% VERIFIED).
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 - ANSWER Termination Area is:
can contain: (2)
100' - ANSWER Recommended Advanced Warning Sign Spaceing: Urban (low
speed)
350' - ANSWER Recommended Advanced Warning Sign Spaceing: urban (high
speed)
500' - ANSWER Recommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' - ANSWER 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. - ANSWER 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 - ANSWER device spacing taper:
tangent:
A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn - ANSWER Warning lights types:
Type A:
Type B:
Type C:
Type D:
Uses for portable changeable message sign PCMS - ANSWER speed drops
significant delays
adverse conditions
advance notice of closures
advance notice of road changes
reinforce static signage
updated guidance information
(missing some basics) Questions with correct Answers
2024/2025( A+ GRADED 100% VERIFIED).
L=(WS²)/60 for 40MPH or less,
L=WS for 45MPH or more - ANSWER 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 - ANSWER speed used in formulas
should be
125' - ANSWER Distance of L for 25 MPH with 12' Lane width
245' - ANSWER Distance of L for 35 MPH with 12' Lane width
540' - ANSWER Distance of L for 45 MPH with 12' Lane width
660' - ANSWER Distance of L for 55 MPH with 12' Lane width
780' - ANSWER Distance of L for 65 MPH 12' Lane width
L Minimum - ANSWER Merging Taper Length
1/2 L Minimum - ANSWER Shifting Taper Length
1/3 L Minimum - ANSWER Shoulder Taper Length
50'-100' regardless of speed
6 devices 10'-20' apart - ANSWER One-Lane, Two-Way Taper (Flagger taper)
Length and number of devices
50'-100' per lane - ANSWER Downstream taper Length
2L - ANSWER Tangent distance (between tapers)
1/2L - ANSWER Tangent distance before shifting taper
Buffer Space
Work Space
Traffic Space - ANSWER 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 -
ANSWER Longitudinal Buffer Space
, ATSSA Traffic Control Supervisor Re-certification
(missing some basics) Questions with correct Answers
2024/2025( A+ GRADED 100% VERIFIED).
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 - ANSWER Termination Area is:
can contain: (2)
100' - ANSWER Recommended Advanced Warning Sign Spaceing: Urban (low
speed)
350' - ANSWER Recommended Advanced Warning Sign Spaceing: urban (high
speed)
500' - ANSWER Recommended Advanced Warning Sign Spaceing: Rural
1000', 1500', and 2640' - ANSWER 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. - ANSWER 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 - ANSWER device spacing taper:
tangent:
A: Low intensity flashing
B: High-intensity flashing
C: Steady Burn
D: 360° steady burn - ANSWER Warning lights types:
Type A:
Type B:
Type C:
Type D:
Uses for portable changeable message sign PCMS - ANSWER speed drops
significant delays
adverse conditions
advance notice of closures
advance notice of road changes
reinforce static signage
updated guidance information
