AIRPORTDES ASSESSMENT2
Used in longer term, mobile, short duration, and short-term stationary work zones where other types of barriers may not be feasible due to the time needed for installation and removal and due to the length of the area being protected
Shadow Vehicles with Truck or Trailer Mounted Attenuators
Project involves moving operation, with enough roll ahead distance
Shadow Vehicles with Truck or Trailer Mounted Attenuators
Does not involve moving operation, 2 days duration, Removal and installation is not a big factor, has isolated work crews
Shadow Vehicles with Truck or Trailer Mounted Attenuators
Project does not involve moving operation, Project duration is 5 days, The buffer space is long enough
Vehicle arresting systems
Workers are at increased risk when traffic speeds are higher. Agencies may define high speed versus low speed, but generally 45 mph or greater is considered a high-speed facility. Consideration should be given to the average speed or the 85th percentile speed in addition to the posted speed limit when determining operating speed
Anticipated traffic speeds through the work zone
Does not involve moving operation, 36-hour duration, Removal and installation is not a big factor, has no isolated work crews, Project is in a low-speed area
Water filled barriers
Does not involve moving operation, 48-hour duration, Removal and installation is not a big factor, has no isolated work crews, Project is in a low-speed area with narrow lanes
Water filled barriers
Performing work during off-peak periods may reduce exposure compared with higher traffic levels during peak periods. Even with reduced exposure to higher traffic, consideration should be given to the time of day and potential impacts on visibility during nighttime work when determining the need for positive protection
Time of day
Positive protection devices should be considered for all roadways when needed, but may be especially important for higher speed, higher mobility roadways such as freeways. For example, portable concrete barriers should be used to separate opposing traffic flows on a freeway crossover and the resulting shared mainline
Roadway classification
These are defined as devices that contain and/or redirect vehicles and meet the crashworthiness evaluation criteria
Positive protection devices
Lateral displacement is usually in the range of 6 to 8 feet when impacted by a full-size pick-up truck. They can be anchored down to minimize deflection
Steel barriers
Projects on roadways with a high percentage of truck and heavy vehicle traffic may benefit from positive protection due to the greater impact potential of a heavy vehicle intrusion into a workspace
Vehicle mix
Typically used where large barrier deflections are less likely due to the lower traffic speeds or low impact angles
Ballas filled barriers