ASTM_E_2667_-_09.pdf

Designation:E266709Standard Practice forAcquiring Intersection Turning Movement Traffic Data1This standard is issued under the fixed designation E2667;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 for intersection turning movement dataacquisition was developed to improve its quality by specifyingthe data items to be collected and a procedure for documentingthe results.Such a practice will provide the ability to comparethese data over time within governmental agencies and amongdifferent governmental agencies.While there are national andinternational standards for road segment traffic data,there isnot a practice for intersection turning movement data acquisi-tion.1.2 UnitsThe values stated in inch-pound units are to beregarded as the standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.3 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 applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E2300 Specification for Highway Traffic Monitoring De-vicesE2532 Test Methods for Evaluating Performance of High-way Traffic Monitoring Devices3.Terminology3.1 Definitions:3.1.1 base data integrity,nretention of original collecteddata in uncorrupted form.3.1.2 truth in data,ndescription of how data are collected,summarized,reported and retained so potential data users canrecalculate summary statistics from the original collected data.3.1.3 vehicle count(volume),ntotal number of vehiclesobserved or predicted to pass a point on a lane or roadwayduring a specified time interval(see Specification E2300 andPractice E2532).3.2 Definitions of Terms Specific to This Standard:3.2.1 adaptive control,na traffic signal controller thatcontinuously changes the timing of signal phases based oninterpretation of traffic information received from multiplesensors.3.2.2 beacon,na flashing signal at an intersection thatmay be constant or actuated.3.2.3 intersection turning movement,nvehicle movementby lane to and through an intersection.3.2.4 intersection turning movement count,ntotal numberof vehicles observed or predicted to move by lane to andthrough an intersection during a specified time interval.3.2.5 intersection turning movement count,ntotal numberof vehicles observed or predicted to move by lane to andthrough an intersection during a specified time interval.3.2.6 pretimed control,na traffic signal controller thatchanges signal phases based on a fixed time period.3.2.7 total intersection traffc,ntotal number of vehiclesin all lanes observed to pass to and through an intersectionduring a specified time interval.4.Significance and Use4.1 This practice will permit various agencies to compareintersection turning movement data using two foundationalprinciples,truth in data and base data integrity.These twoprinciples help ensure that intersection turning movementcounts can be correctly interpreted and appropriately used toimprove the safe and efficient operation of intersections.Theprinciples may be summarized as follows:4.1.1 Truth in data principleThe truth in data principleprovides information that assists potential data users to under-stand what the data do and do not mean.The opportunity tocollect data that advise safe and efficient transportation carrieswith it the obligation to report how the data were collected,edited,summarized,and reported.4.1.2 Base data integrity principleThe principle of basedata integrity retains the field data collected.In keeping withthe principle of base data integrity,it is possible to look at the1This 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 Feb.1,2009.Published February 2009.DOI:10.1520/E2667-09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer 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 original data to verify any subsequent changes to the data.Inintersection turning movement and other data collectionactivities,field data may be edited,adjusted,and then summa-rized and reported.Whatever steps are taken to ensure thequality of the data summarized,the base data must not becorrupted.In keeping with the principle of truth in data,editingand adj