ATSSA TRAFFIC CONTROL SUPERVISOR RE-CERTIFICATION (MISSING SOME
BASICS) TEST QUESTIONS AND ALL ANSWERS CORRECT
The formula for the minimum taper length is L=(WS²)/60 for 40 mph or less
and L=WS for 45 mph or greater.
the 85th percentile off peak. The answer speed that should be used in formulae
is the speed at or below which 85% of vehicles operate in free flow conditions.
125' is the answer distance of L at 25 mph with a 12-foot lane width.
245' is the answer distance of L at 35 mph and 12' lane width.
540' is the answer distance of L at 45 mph and a lane width of 12'.
660' is the answer distance for L at 55 mph with a lane width of 12'.
780' is the answer distance of L for a 12' lane width at 65 mph.
L Minimum: ANSWER Merging Taper Length
ANSWER Shifting Taper Length: 1/2 L Minimum
ANSWER Shoulder Taper Length: 1/3 L Minimum
50'-100', regardless of velocity
Six gadgets 10'-20' apart ANSWER Length and quantity of devices in a one-
lane, two-way taper (flagger taper)
ANSWER Downstream taper Length: 50'-100' per lane
2L: REPLY Tangent separation (between tapers)
1/2L: REPLY Tangent distance prior to taper shifting
Workspace, Buffer Space, Traffic Space, and ANSWER Activity Area Sub-
parts (3)
, Errant vehicle recovery area: Design that is forgiving
safeguards drivers and employees
Always totally clear or vacant
No cars, equipment, materials, or truck-mounted attenuator
STRONGLY SUGGESTED: Unless there's a verified reason not to
Longitudinal Buffer Space ANSWER
Road users are redirected to their usual route from the work area's downstream
end to the last device, such as the end work zone sign.
may include:
End work zone sign: typically 500' past the last device; downstream taper: 50'-
100' per lane; ANSWER Termination Area is:
may include: (2)
100' is the recommended advanced warning sign spacing for urban areas (low
speed).
The recommended advanced warning sign spacing for metropolitan areas is 350
feet (high speed).
The recommended advanced warning sign spacing in rural areas is 500 feet.
The recommended advanced warning sign spacing for freeways and
expressways is 1000', 1500', and 2640' (3).
1 Mile 50% shoulder at the start of the taper, if at all possible; if not, as close to
the start as feasible during the taper. ANSWER Arrow board visibility distance
by design:
Dimming at night:
place:
taper: not to go over the posted speed limit in feet
tangent: distance = twice the posted speed limit ANSWER device separation
Tangent: taper
A: Flashing at a low intensity
B: Flashing at a high intensity
C: Consistent Burn
D: 360° continuous burn ANSWER Types of warning lights:
Type A
Type B: Type C: Type D:
BASICS) TEST QUESTIONS AND ALL ANSWERS CORRECT
The formula for the minimum taper length is L=(WS²)/60 for 40 mph or less
and L=WS for 45 mph or greater.
the 85th percentile off peak. The answer speed that should be used in formulae
is the speed at or below which 85% of vehicles operate in free flow conditions.
125' is the answer distance of L at 25 mph with a 12-foot lane width.
245' is the answer distance of L at 35 mph and 12' lane width.
540' is the answer distance of L at 45 mph and a lane width of 12'.
660' is the answer distance for L at 55 mph with a lane width of 12'.
780' is the answer distance of L for a 12' lane width at 65 mph.
L Minimum: ANSWER Merging Taper Length
ANSWER Shifting Taper Length: 1/2 L Minimum
ANSWER Shoulder Taper Length: 1/3 L Minimum
50'-100', regardless of velocity
Six gadgets 10'-20' apart ANSWER Length and quantity of devices in a one-
lane, two-way taper (flagger taper)
ANSWER Downstream taper Length: 50'-100' per lane
2L: REPLY Tangent separation (between tapers)
1/2L: REPLY Tangent distance prior to taper shifting
Workspace, Buffer Space, Traffic Space, and ANSWER Activity Area Sub-
parts (3)
, Errant vehicle recovery area: Design that is forgiving
safeguards drivers and employees
Always totally clear or vacant
No cars, equipment, materials, or truck-mounted attenuator
STRONGLY SUGGESTED: Unless there's a verified reason not to
Longitudinal Buffer Space ANSWER
Road users are redirected to their usual route from the work area's downstream
end to the last device, such as the end work zone sign.
may include:
End work zone sign: typically 500' past the last device; downstream taper: 50'-
100' per lane; ANSWER Termination Area is:
may include: (2)
100' is the recommended advanced warning sign spacing for urban areas (low
speed).
The recommended advanced warning sign spacing for metropolitan areas is 350
feet (high speed).
The recommended advanced warning sign spacing in rural areas is 500 feet.
The recommended advanced warning sign spacing for freeways and
expressways is 1000', 1500', and 2640' (3).
1 Mile 50% shoulder at the start of the taper, if at all possible; if not, as close to
the start as feasible during the taper. ANSWER Arrow board visibility distance
by design:
Dimming at night:
place:
taper: not to go over the posted speed limit in feet
tangent: distance = twice the posted speed limit ANSWER device separation
Tangent: taper
A: Flashing at a low intensity
B: Flashing at a high intensity
C: Consistent Burn
D: 360° continuous burn ANSWER Types of warning lights:
Type A
Type B: Type C: Type D:
