ATSSA TCS Modules 3 Parts of TTC Zone
& 4 TTC Devices Exam Questions and
Answers (Latest 2026)
Roundabouts - Correct Answers ✅Not in MUTCS. Consider
detours. If single lane, treat as flagger operation. Getting
popular
Speed - Correct Answers ✅Posted speed=speed limit (min)
Off-peak 85th percentile speed prior to work starting or the
anticipated operating speed. Not necessarily the posted
speed
85th percentile speed - Correct Answers ✅The speed at or
below which 85 percent of the motor vehicles travel
operating speed in free flow conditions. Often 7-8 mph above
posted speed
Multiple tapers - Correct Answers ✅If more than one taper
is needed, they should be separated by a tangent (transition)
distance. This distance allows drivers to adjust to one
condition before moving to another one. Two cases: 1)
Merging taper followed by a second merging taper -2L
2) Merging taper followed by a shifting taper - 1/2L
Signs clearances - Correct Answers ✅Clearances: 1)
Rural=5ft min. with advisory speed plaque=4 ft. min.2)
Business, commercial and residential= 7 ft.
, ATSSA TCS Modules 3 Parts of TTC Zone
& 4 TTC Devices Exam Questions and
Answers (Latest 2026)
Signs colors and sizes - Correct Answers ✅13 colors most
common - For conventional road= the majority of the signs
measure 30 x 30, 36 x36, 24 x 18, 24 x 12 and Road closed
48 x30
Arrow boards - Correct Answers ✅Are a supplemental
device used in addition to signs, barricades or other TC
devices. Type C board for high-speed facilities (1 mile
visibility), 50% dimming at night. Locate on shoulder at
beginning of taper. If no room place it inside taper behind
channelizing devices, as close to the merging point as
possible. Do not use on a two-lane, two-way roadway for
temporary one-lane operation nor for on lane shifts.
Portable Changeable Message Signs PCMS - Correct
Answers ✅Most frequently used in High-density urban
freeways. Should be used as a supplement not as a substitute
for conventional signs and pavement markings. Advise road
users of unexpected situations. Message as brief as possible.
Should contain 3 thoughts.
PCMS - Correct Answers ✅Placed 500-800 feet in advance
of the work zone conflicts at or 1.5 to 2 miles in advance of
complex traffic control schemes. At night, intensity of flashers
reduced. Be visible from 1/2 mile day and night.Limited 3
lines. 8 characters per line.
& 4 TTC Devices Exam Questions and
Answers (Latest 2026)
Roundabouts - Correct Answers ✅Not in MUTCS. Consider
detours. If single lane, treat as flagger operation. Getting
popular
Speed - Correct Answers ✅Posted speed=speed limit (min)
Off-peak 85th percentile speed prior to work starting or the
anticipated operating speed. Not necessarily the posted
speed
85th percentile speed - Correct Answers ✅The speed at or
below which 85 percent of the motor vehicles travel
operating speed in free flow conditions. Often 7-8 mph above
posted speed
Multiple tapers - Correct Answers ✅If more than one taper
is needed, they should be separated by a tangent (transition)
distance. This distance allows drivers to adjust to one
condition before moving to another one. Two cases: 1)
Merging taper followed by a second merging taper -2L
2) Merging taper followed by a shifting taper - 1/2L
Signs clearances - Correct Answers ✅Clearances: 1)
Rural=5ft min. with advisory speed plaque=4 ft. min.2)
Business, commercial and residential= 7 ft.
, ATSSA TCS Modules 3 Parts of TTC Zone
& 4 TTC Devices Exam Questions and
Answers (Latest 2026)
Signs colors and sizes - Correct Answers ✅13 colors most
common - For conventional road= the majority of the signs
measure 30 x 30, 36 x36, 24 x 18, 24 x 12 and Road closed
48 x30
Arrow boards - Correct Answers ✅Are a supplemental
device used in addition to signs, barricades or other TC
devices. Type C board for high-speed facilities (1 mile
visibility), 50% dimming at night. Locate on shoulder at
beginning of taper. If no room place it inside taper behind
channelizing devices, as close to the merging point as
possible. Do not use on a two-lane, two-way roadway for
temporary one-lane operation nor for on lane shifts.
Portable Changeable Message Signs PCMS - Correct
Answers ✅Most frequently used in High-density urban
freeways. Should be used as a supplement not as a substitute
for conventional signs and pavement markings. Advise road
users of unexpected situations. Message as brief as possible.
Should contain 3 thoughts.
PCMS - Correct Answers ✅Placed 500-800 feet in advance
of the work zone conflicts at or 1.5 to 2 miles in advance of
complex traffic control schemes. At night, intensity of flashers
reduced. Be visible from 1/2 mile day and night.Limited 3
lines. 8 characters per line.
