ASTM_E_1318_-_09.pdf

Designation:E131809Standard Specification forHighway Weigh-In-Motion(WIM)Systems with UserRequirements and Test Methods1This standard is issued under the fixed designation E1318;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 Weigh-In-MotionThis specification describes Weigh-In-Motion(WIM),the process of measuring the dynamic tireforces of a moving vehicle and estimating the correspondingtire loads of the static vehicle.Gross-vehicle weight of ahighway vehicle is due only to the local force of gravity actingupon the composite mass of all connected vehicle components,and is distributed among the tires of the vehicle throughconnectors such as springs,motion dampers,and hinges.Highway WIM systems are capable of estimating the grossweight of a vehicle as well as the portion of this weight,calledload in this specification,that is carried by the tires of eachwheel assembly,axle,and axle group on the vehicle.1.2 Other Traffc DataAncillary traffic data concerningthe speed,lane of operation,date and time of passage,numberand spacing of axles,and classification(according to axlearrangement)of each vehicle that is weighed in motion isdesired for certain purposes.It is feasible for a WIM system tomeasure or calculate these traffic parameters and to process,summarize,store,display,record,hard-copy,and transmit theresulting data.Furthermore,differences in measured or calcu-lated parameters as compared with selected control criteria canbe detected and indicated to aid enforcement.In addition totire-load information,a WIM system is capable of producingall,or specified portions of,these traffic data.1.3 Standard SpecificationHighway WIM systems gener-ally have three applications:collecting statistical traffic data,aiding enforcement,and enforcement.This specification clas-sifies four types of WIM systems according to their applicationand details their respective functional,performance,and userrequirements.It is a performance-type(end product-type)specification.Exceptions and options to the specification maybe included in any specification prepared by the user as part ofthe procurement process for WIM equipment or services,andvendors may offer exceptions and options in responding to aninvitation to bid.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.21.5 The following precautionary caveat applies only to thetest method portion,Section 7,of this specification.Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:3E867 Terminology Relating to Vehicle-Pavement Systems2.2 AASHTO Standards:4Interim Guide for Design of Pavement Structures1972,1981Guide for Design of Pavement Structures1986,19933.Terminology3.1 Definitions:3.1.1 weigh-in-motion(WIM),nthe process of estimatinga moving vehicles gross weight and the portion of that weightthat is carried by each wheel,axle,or axle group,or combi-nation thereof,by measurement and analysis of dynamicvehicle tire forces.(See Terminology E867)3.2 Definitions of Terms Specific to This Standard:3.2.1 accuracy,nthe closeness or degree of agreement(satisfies a stated tolerance and percent compliance)between avalue measured or estimated by a WIM system and an acceptedreference value.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 Feb.1,2009.Published February 2009.Originallyapproved in 1990.Last previous edition approved in 2002 as E1318 02.DOI:10.1520/E1318-09.2ASTM SI10-02 IEEE/ASTM SI 10American National Standard for Use of theInternational System of Units(SI):The Modern Metric System,The Institute ofElectrical and Electronics Engineers,Inc.,1828 L.St.NW,Suite 1202,Washington,DC 200365101,USA,and ASTM International,100 Barr Harbor Drive,WestConshohocken,PA 19428-2959,USA,www.astm.org.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 website.4Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.