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ATSSA TRAFFIC CONTROL SUPERVISOR RE-
CERTIFICATION EXAM 2025 NEWEST EXAM WITH
QUESTIONS AND DETAILED CORRECT SOLUTIONS.
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 - correct answer
- when not in use, where should a PCMS be? portable changeable message sign 1/2 mile visibility day and night - correct answer - how far should a PCMS be visible? Portable changeable message sign Manual for Assessing Safety Hardware MASH - correct answer - NCHRP 350 rewritten by AASHTO and is now an AASHTO document called what?
Temporary Traffic Barriers - correct 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. - correct answer - Barrier selection guidelines based on Barrier deflection - correct answer - the distance a barrier will displace when struck portable concrete barriers - correct answer - less expensive for long-term projects, easy to maintain, reusable, low deflection. Heavy equipment needed for installation. concrete, water-filled, anchored, move-able, mobile, steel - correct answer - types of temporary traffic barriers
from,
and is how far channel pin and loop (to be phased-out) - correct answer - types of barrier connections Stationary non-redirective (inertial) Impact Attenuators - correct answer - Sand barrels are an example of what? Re-direct vehicles that impact them - correct answer - Re-directive Impact Attenuators do what? Decelerate the vehicle to a stop - correct answer - stationary non- redirective Impact Attenuators do what? Minimum of 30" - correct answer - Impact Barrels should overlap the fixed object on the traffic side by: Stationing 0+00' - correct answer - A conventional way of identifying distances on the plan and on the ground. Located every hundred feet.
L=(WS²)/60 for 40MPH or less, L=WS for 45MPH or more - correct 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 - correct answer - speed used in formulas should be 125' - correct answer - Distance of L for 25 MPH with 12' Lane width 245' - correct answer - Distance of L for 35 MPH with 12' Lane width 540' - correct answer - Distance of L for 45 MPH with 12' Lane width 660' - correct answer - Distance of L for 55 MPH with 12' Lane width 780' - correct answer - Distance of L for 65 MPH 12' Lane width L Minimum - correct answer - Merging Taper Length
1/2 L Minimum - correct answer - Shifting Taper Length 1/3 L Minimum - correct answer - Shoulder Taper Length 50'-100' regardless of speed 6 devices 10'-20' apart - correct answer - One-Lane, Two-Way Taper (Flagger taper) Length and number of devices 50'-100' per lane - correct answer - Downstream taper Length 2L - correct answer - Tangent distance (between tapers) 1/2L - correct answer - Tangent distance before shifting taper Buffer Space Work Space Traffic Space - correct answer - Activity Area Sub-components (3)
500' - correct answer - Recommended Advanced Warning Sign Spaceing: Rural 1000', 1500', and 2640' - correct 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. - correct 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 - correct answer - device spacing taper: tangent: A: Low intensity flashing B: High-intensity flashing C: Steady Burn D: 360° steady burn - correct answer - Warning lights types:
Type A: Type B: Type C: Type D: Uses for portable changeable message sign PCMS - correct 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) - correct 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
