ASTM_E_2415_-_05_2018.pdf

Designation:E241505(Reapproved 2018)Standard Practice forInstalling Piezoelectric Highway Traffic Sensors1This standard is issued under the fixed designation E2415;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the installation of piezoelectrictire-force sensors that are used to detect axles when counting,classifying,or weighing vehicles as part of a roadway trafficmonitoring program.Piezoelectric sensors are often used inpairs and combined with other roadway sensors such asinductive loops to classify and weigh vehicles.1.2 The practice applies only to piezoelectric tire-forcesensors used for the detection of vehicle axles on a roadway.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are for informa-tion only and are not considered standard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2E867 Terminology Relating to Vehicle-Pavement SystemsE1318 Specification for Highway Weigh-In-Motion(WIM)Systems with User Requirements and Test MethodsE1442 Practice for Highway-Traffic Monitoring(Withdrawn2001)3E1572 Practice for Classifying Highway Vehicles fromKnown Axle Count and Spacing(Withdrawn 2002)3E1957 Practice for Installing and Using Pneumatic TubesWith Roadway Traffic Counters and Classifiers3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 axleaxis oriented transversely to the nominal direc-tion of vehicle motion and extending the full width of thevehicle,about which the wheels at both ends rotate.3.1.2 axle countnumber of vehicle axles that are enumer-ated at a point on a lane or roadway during a specified timeinterval.3.1.3 axle countera device that receives signals from anaxle sensor and indicates the cumulative number of axles thathave been detected by the sensor during a specified timeinterval.3.1.4 axle spacinghorizontal distance between the centerof a vehicle axle and that of the preceding axle on the vehicle.3.1.5 machinecountcumulativenumberofaxles,vehicles,or vehicles within specified classes,or all of these,indicated or recorded by a traffic recording device for aspecified time interval.3.1.6 traffc counterdevice that indicates,and usuallyrecords,the number of vehicles or vehicle axles,or both,thatpass a point on a lane or roadway during a specified timeinterval.3.1.7 traffc recording deviceunit that receives outputfrom a sensor(s)and registers axle count,vehicle count,vehicleclassification count,speed,gap,or headway(any or all ofthese)for defined time intervals.3.1.7.1 DiscussionA traffic recording device may alsorecord axle load and gross vehicle weight.Refer to Specifica-tion E1318.3.1.8 vehicleone or multiple mobile unit(s)designed fortravel upon a roadway;a vehicle comprises one powered unitand may include one or more non-powered trailer or semitrailerunit(s).3.1.9 vehicle classification countcumulative number ofvehicles of each defined type(class)indicated or recorded fora specified time interval.1This practice is under the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.52 onTraffic Monitoring.Current edition approved Sept.1,2018.Published September 2018.Originallyapproved in 2005.Last previous edition approved in 2012 as E2415 05(2012).DOI:10.1520/E2415-05R18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.Summary of Practice4.1 Site Selection:4.1.1 Select a relatively straight and smooth section