1、Designation:E253209Standard Test Methods forEvaluating Performance of Highway Traffic MonitoringDevices1This standard is issued under the fixed designation E2532;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.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 PurposeThe two test methods contained in this stan-dard define acceptance tests for evaluating the performance ofa Traffic Monitoring
3、Device(TMD)according to the functionsit performs,the data it provides,the required accuracy of thedata,and the conditions under which the device operates.Acceptance tests are recommended whenever a TMD ispurchased,installed,or performance validation is desired.Thetests are performed in a field envir
4、onment and result in anaccept or a reject decision for the TMD under test.1.2 ExceptionsExceptions and options to the test methodsmay be included in any derivative test method presented by auser as part of the procurement process for TMDs.Sellers mayoffer exceptions and options in responding to an i
5、nvitation tobid.1.3 UnitsThe values stated in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units,2which are provided forinformation only and are not considered standard.1.4 The following safety procedures apply to Sections 6 and7,wh
6、ich describe the details of the acceptance test methods.When a test site accessible by the public(for example,a streetor highway)is used for the acceptance test of the TMD,obtainapproval from the public authority having jurisdiction over thesite for the traffic control procedures to be used during t
7、he test.This standard does not purport to address all of the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Docum
8、ents2.1 ASTM Standards:3E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE867 Terminology Relating to Vehicle-Pavement SystemsE1318 Specification for Highway Weigh-In-Motion(WIM)Systems with User Requirements and Test MethodsE2300 Specification for Highway Traffic Monitoring
9、De-vices3.Terminology3.1 Definitions of terms and definitions of terms specific tothese test methods are given below.3.2 Definitions:3.2.1 accepted reference value,nvalue attributed to aparticular quantity(for example,vehicle class by number ofaxles and interaxle spacings,vehicle count,lane occupanc
10、y,orvehicle speed)and agreed upon by the user and seller inadvance of testing of a TMD,which has an uncertaintyappropriate for the given purpose.E23003.2.2 accuracy,ncloseness of agreement between a valueindicated by a TMD and an accepted reference value.E23003.2.3 axle,naxis oriented transversely t
11、o the nominaldirection of vehicle motion,and extending the full width of thevehicle,about which the wheels at both ends rotate.E867,E13183.2.4 axle count,nnumber of vehicle axles enumerated ata point on a lane or roadway during a specified time interval.E8673.2.5 bias,na generic concept related to a
12、 consistent orsystematic difference between a set of test results from theprocess and an accepted reference value of the property beingmeasured.E1773.2.6 correct detection,nan indication by a TMD that avehicle actually passing over the detection area of the TMD isdetected by the TMD.E23001These test
13、 methods are under the jurisdiction of ASTM Committee E17 onVehicle-Pavement Systems and are the direct responsibility of SubcommitteeE17.52 on Traffic Monitoring.Current edition approved July 1,2009.Published July 2009.Originally approvedin 2006.Last previous edition approved in 2006 as E2532 06.DO
14、I:10.1520/E2532-09.2Standard Practice for Use of the International System of Units(SI):TheModern Metric System,IEEE/ASTM SI 10TM-2002,The Institute of Electrical andElectronics Engineers(IEEE),Inc.,3 Park Avenue,New York,NY,10016-5997,USA and American Society for Testing and Materials(ASTM),100 Barr
15、 HarborDrive,West Conshohocken,PA 19428-2959,USA,ISBN 0-7381-3317-5.3For 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 websit
16、e.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.7 data item,ncharacteristic associated with individualvehicles(for example,count,class,and speed)or the con-tinuum of vehicles at a location(for example,density,flowrate,and queue length).E23003.2.8 detection area,nroad surface area above which asensor detects a vehicle or vehicle component.E23003.2.9 electronics unit,ndevice that provides power to oneor more sensors,filters and am
