ATSSA Traffic Control Supervisor Re-
certification (missing some basics)
Questions and Answers
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
placed 500'-800' ahead of workzone conflicts or 1.5-2 miles ahead of complex traffic
control
uses of screens (mounted on top of rail) - Answer-limit distractions and discourage
rubbernecking
reduce headlight glare from oncoming traffic
reduce floodlight glare from night work
should not be mounted where they reduce motirist visibility and sight distance
125' 245' 540' 660' 780' - Answer-Distance of L with 12' Lane Width for:\
25, 35, 45, 55, 65 MPH
Moved outside the clear zone or be shielded by barrier or crash cushion
placed on the shoulder or further from the traveled lane
delineated with retroreflective material in a continuous line - Answer-when not in use,
where should a PCMS be?
portable changeable message sign
1/2 mile visibility day and night - Answer-how far should a PCMS be visible?
Portable changeable message sign
*M*anual for
*A*ssessing
*S*afety
*H*ardware
MASH - Answer-NCHRP 350 rewritten by AASHTO and is now an AASHTO document
called what?
, Temporary Traffic Barriers - Answer-Portable devices designed to prevent penetration
by vehicles while minimizing injuries to vehicle occupants.
Main function: PROTECTION
Secondary function: CHANNELIZATION
if not needed for protection then it *SHALL NOT BE USED*
speed, traffic volume / composition, road classification, deflection space, roadway
alignment, sight distance, other factors. - Answer-Barrier selection guidelines based on
Barrier deflection - Answer-the distance a barrier will displace when struck
portable concrete barriers - Answer-less expensive for long-term projects, easy to
maintain, reusable, low deflection. Heavy equipment needed for installation.
Light in color and supplemented with standard delineation or pavement markings -
Answer-If Temporary Traffic Barriers are used as channelizing devices they should be:
Appropriately flared or protected with properly installed crash cushions - Answer-The
blunt end of a barrier is a hazard. *ALL* upstream leading ends shall be:
Decrease by 2:1 per 5 MPH
stopping at 30 MPH with 8:1 - Answer-Below 60 MPH Barrier Flare Rates Decrease by
The exposed end is outside the clear zone - Answer-Extend Barrier Rail Flare until
The edge of the *TRAVELED* lane
Typically 30' for High-speed facilities - Answer-Clear Zone is measured from,
and is how far
channel
pin and loop (to be phased-out) - Answer-types of barrier connections
Stationary non-redirective (inertial) Impact Attenuators - Answer-Sand barrels are an
example of what?
Re-direct vehicles that impact them - Answer-Re-directive Impact Attenuators do what?
Decelerate the vehicle to a stop - Answer-stationary non-redirective Impact Attenuators
do what?
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