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ATSSA TCS Modules 3 Parts of TTC Zone & 4 TTC Devices questions with verified solutions

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Roundabouts Not in MUTCS. Consider detours. If single lane, treat as flagger operation. Getting popular Speed Posted speed=speed limit (min) Off-peak 85th percentile speed prior to work starting or the anticipated operating speed. Not necessarily the posted speed Previous Play N...

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  • 1 de septiembre de 2024
  • 4
  • 2024/2025
  • Examen
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  • atssa tcs modules 3 parts of ttc zone 4 ttc

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  • ATSSA TCS
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ATSSA TCS Modules 3 Parts of
TTC Zone & 4 TTC Devices
questions with verified
solutions 2024-2025

Roundabouts - answer Not in MUTCS. Consider detours. If single lane,
treat as flagger operation. Getting popular


Speed - answer 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 - answer 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 - answer 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 - answer Clearances: 1) Rural=5ft min. with advisory
speed plaque=4 ft. min.2) Business, commercial and residential= 7 ft.


Signs colors and sizes - answer 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 - answer 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

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