1、Designation:E230009Standard Specification forHighway Traffic Monitoring Devices1This standard is issued under the fixed designation E2300;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 parenthes
2、es indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification describes the recommended proce-dure for identifying the performance and operating require-ments to be included in a purchase order for Tra
3、ffic MonitoringDevices.As such,the specification can be referenced by theuser and seller when determining compliance with each speci-fied requirement.It is the intent of this specification to have theuser require the seller to provide evidence that the brand andmodel of TMD offered by the seller has
4、 passed an applicableType-approval Test.If the TMD has not previously passed aType-approval Test,then it is the intent of this specification tohave the device type-approved before it is accepted by the user.If the TMD has previously passed a Type-approval Test,thenthis specification requires that th
5、e production version of thedevice provided by the seller pass an On-site Verification Testbefore being accepted by the user.1.2 Traffc Monitoring DeviceA Traffic Monitoring De-vice(TMD)is equipment that counts and classifies vehiclesand measures vehicle flow characteristics such as vehiclespeed,lane
6、 occupancy,turning movements,intervehicle gaps,and other parameters typically used to portray traffic move-ment.TMDs usually contain a sensing element that convertsthe signal-generating phenomenon(such as,air pulse generatedby a vehicle tire passing over a pneumatic tube)into anelectrical signal and
7、 electronics that amplify,filter,and other-wise condition the signal.Some TMDs provide outputs as relayor solid-state switch closures,while others contain signalprocessing that translates the signal into the required vehicleand vehicle flow data.TMDs whose outputs are relay or solidstate switch clos
8、ures may be connected to roadside controllers,which process the switch-closure information and convert itinto vehicle flow data.1.3 Characterization of Traffc Monitoring DevicesThisspecification classifies Traffic Monitoring Devices by thefunctions they perform,the data they provide,the requiredaccu
9、racy of the data,and the conditions under which the deviceis expected to operate in conformity with the requirementsdeveloped through this specification.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units tha
10、t are provided for information onlyand are not considered standard.1.5 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 and health practices and determine the appli
11、ca-bility of regulatory limitations prior to use.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 MethodsE2532 Test Methods for Evaluating Performance of High-way
12、 Traffic Monitoring Devices3.Terminology3.1 Definitions of terms and definitions of terms specific tothis specification are given below.3.2 Definitions:3.2.1 axle,naxis oriented transversely to the nominaldirection of vehicle motion,and extending the full width of thevehicle,about which the wheels a
13、t both ends rotate.(E867,E1318)3.2.2 axle count,nnumber of vehicle axles enumerated ata point on a lane or roadway during a specified time interval.(E867)3.2.3 vehicle,none or more mobile units coupled togetherfor travel on a highway;a vehicle contains one powered unitand may include one or more non
14、-powered full-trailer orsemi-trailer units.(E867)3.3 Definitions of Terms Specific to This Standard:1This specification is under the jurisdiction ofASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.52 onTraffic Monitoring.Current edition approved Jul
15、y 1,2009.Published July 2009.Originally approvedin 2006.Last previous edition approved in 2006 as E2300 06.DOI:10.1520/E2300-09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,re
16、fer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.3.1 accepted reference value,na particular quantity(number of vehicles in a particular class defined by number ofaxles and interaxle spacings,vehicle count,lane occupancy,orvehicle speed)that is agreed upon by the user and seller inadvance of testing of a TMD,which has an uncertaintyappropriate for the given purpose.3.3.2 ac
