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- Impact_attenuator abstract "An impact attenuator, also known as a crash cushion, crash attenuator, or cowboy cushions, is a device intended to reduce the damage to structures, vehicles, and motorists resulting from a motor vehicle collision. Impact attenuators are designed to absorb the colliding vehicle's kinetic energy. They may also be designed to redirect the vehicle away from the hazard or away from roadway machinery and workers. Impact attenuators are usually placed in front of fixed structures near freeways, such as gore points, Jersey barrier introductions, or overpass supports and temporary versions can be used for road construction projects.Truck-mounted versions, similar in some ways to railcar buffers, can be deployed on vehicles that are prone to being struck from behind, such as snow plows and road construction or maintenance vehicles. Work zone regulations often specify a minimum buffer distance between the attenuator truck and the work area, and a minimum mass for the truck, to minimize the chances that the truck will be pushed forward by a crash into the workers or machinery. This is especially important in mobile work zones, where the truck's parking brake may not be engaged, or the truck may be in movement (albeit slower than the vehicles that could crash into it).Impact attenuators can be categorized by the method used to dissipate kinetic energy: Momentum transfer. Many early models used successive rows of sand- or water-filled barrels or modules. Momentum is transferred to the sand or water, reducing the speed of the impacting vehicle. Material deformation. Many newer attenuators use crushable materials that create a crumple zone, absorbing energy. Others flatten a corrugated steel guard rail section, or split a steel box beam. Friction. Some attenuators work by forcing a steel cable or strap through an angled slot or tube, converting kinetic energy into heat.In the United States, impact attenuators are tested and classified according to AASHTO Manual for Assessing Safety Hardware (MASH), which superseded the Federal Highway Administration NCHRP Report 350. Classification is based on the maximum speed of a vehicle during a collision for which the attenuator is designed.Absorbing Crash Cushions The ABSORB 350 water-filled anchorless attenuator was developed in 2000 to protect errant motorists from blunt end Quickchange Moveable Barrier. The unique design of the water filled crash cushion allows the unit to be picked up and repositioned by a barrier transfer machine or crane in one step even while filled with water. A group in Canada noticed how easy this system was to deploy and asked permission to use this crash cushion in other applications. A test installation was initiated to shield standard portable concrete barrier instead of QMB barrier. The evaluation was a success. Soon after, the Federal Highway Administration issued a series of NCHRP 350 TL-3 acceptance letters to allow the crash cushion to be used to protect motorists from the blunt end of almost any profile of concrete median barrier.Other water-filled anchorless crash cushions available include the SLED system and the ACZ-350 System.".
- Impact_attenuator thumbnail Impact_Attenuator_In_Auckland.jpg?width=300.
- Impact_attenuator wikiPageExternalLink nchrp_350.
- Impact_attenuator wikiPageID "4527796".
- Impact_attenuator wikiPageLength "5355".
- Impact_attenuator wikiPageOutDegree "26".
- Impact_attenuator wikiPageRevisionID "691248384".
- Impact_attenuator wikiPageWikiLink American_Association_of_State_Highway_and_Transportation_Officials.
- Impact_attenuator wikiPageWikiLink Auto_racing.
- Impact_attenuator wikiPageWikiLink Buffer_(rail_transport).
- Impact_attenuator wikiPageWikiLink Category:Road_infrastructure.
- Impact_attenuator wikiPageWikiLink Category:Road_safety.
- Impact_attenuator wikiPageWikiLink Controlled-access_highway.
- Impact_attenuator wikiPageWikiLink Crumple_zone.
- Impact_attenuator wikiPageWikiLink Federal_Highway_Administration.
- Impact_attenuator wikiPageWikiLink Gore_(road).
- Impact_attenuator wikiPageWikiLink Guard_rail.
- Impact_attenuator wikiPageWikiLink Highway.
- Impact_attenuator wikiPageWikiLink Jersey_barrier.
- Impact_attenuator wikiPageWikiLink John_Fitch_(racing_driver).
- Impact_attenuator wikiPageWikiLink Kinetic_energy.
- Impact_attenuator wikiPageWikiLink Motor_vehicle.
- Impact_attenuator wikiPageWikiLink Overpass.
- Impact_attenuator wikiPageWikiLink Snowplow.
- Impact_attenuator wikiPageWikiLink Strafing.
- Impact_attenuator wikiPageWikiLink Traffic_barrier.
- Impact_attenuator wikiPageWikiLink United_States.
- Impact_attenuator wikiPageWikiLink World_War_II.
- Impact_attenuator wikiPageWikiLink File:FitchBarrels2008.jpg.
- Impact_attenuator wikiPageWikiLink File:Impact_Attenuator_In_Auckland.jpg.
- Impact_attenuator wikiPageWikiLinkText "Impact attenuator".
- Impact_attenuator wikiPageWikiLinkText "Impact attenuator#Fitch Barrier".
- Impact_attenuator wikiPageWikiLinkText "attenuators".
- Impact_attenuator wikiPageWikiLinkText "fitch water barriers".
- Impact_attenuator wikiPageWikiLinkText "impact attenuation".
- Impact_attenuator wikiPageWikiLinkText "impact attenuator".
- Impact_attenuator wikiPageUsesTemplate Template:Reflist.
- Impact_attenuator subject Category:Road_infrastructure.
- Impact_attenuator subject Category:Road_safety.
- Impact_attenuator hypernym Device.
- Impact_attenuator type Device.
- Impact_attenuator type Road.
- Impact_attenuator type Redirect.
- Impact_attenuator type Road.
- Impact_attenuator comment "An impact attenuator, also known as a crash cushion, crash attenuator, or cowboy cushions, is a device intended to reduce the damage to structures, vehicles, and motorists resulting from a motor vehicle collision. Impact attenuators are designed to absorb the colliding vehicle's kinetic energy. They may also be designed to redirect the vehicle away from the hazard or away from roadway machinery and workers.".
- Impact_attenuator label "Impact attenuator".
- Impact_attenuator sameAs Q519551.
- Impact_attenuator sameAs Tlumič_nárazu.
- Impact_attenuator sameAs Anpralldämpfer.
- Impact_attenuator sameAs 衝突衝撃緩衝具.
- Impact_attenuator sameAs m.0c7817.
- Impact_attenuator sameAs Q519551.
- Impact_attenuator wasDerivedFrom Impact_attenuator?oldid=691248384.
- Impact_attenuator depiction Impact_Attenuator_In_Auckland.jpg.
- Impact_attenuator isPrimaryTopicOf Impact_attenuator.