VDC - Meeting Minutes June 2000






ASTM SUBCOMMITTEE E17.52 on TRAFFIC MONITORING DEVICES - Meeting Minutes - June 1999
AASTM SUBCOMMITTEE E17.52 on TRAFFIC MONITORING DEVICES Minutes of June 29, 1999, Meeting Sheraton Seattle Hotel - Seattle, Washington CALL TO ORDER The meeting was called to order at 8:05 a.m. by Chair, Luz Elena Y. Mimbela (see Attachment 1 for the list of attending members). MINUTES Minutes of the last meeting, December 8, 1998, in Nashville, Tennessee were approved as written. Motion by Perry Kent, second by Dr. Clyde Lee. TASK GROUP REPORTS E17.52.92.2 - Pneumatic Road Tube (Perry Kent - Chairman) The"Standard Specification for Pneumatic Tubing for Roadway Traffic Monitoring Devices" was submitted for reballoting in October, 1998. During the last balloting process, the group discussed the negative by Mr. Peter Keen pertaining to the need to add a specific number to quantify the strength of the air pulse necessary to trigger the data collection device located at the end of the road tube. At the December 8, 1998 meeting in Nashville, Mr. Ted Gilfert of ATSI volunteered to collect data that would help the task group quantify the strength of the air pulse. Although Mr. Gilfert was unable to attend the June 29, 1999 meeting, he sent the data that has been collected thus far (see attachment 2). Mr. Gilfert commented on the accuracy of the pressure measuring instrument as being lousy due to its large range of 0 to 30 psi. Therefore, to obtain more accurate data a 0 to 5 psi pressure sensor will be used. Dr. Clyde Lee suggested that additional data be collected for two tube lengths at high and low speeds. For example, the first tube length used might be 15-20 ft. and a second tube length might be 50-60 feet. Perry Kent reported on his attempt to include rubber manufacturers, Sperry and Hannah, in the standards development process. Only Hannah Rubber had responded as of June, 1999. Hannah Rubber's response after reviewing the proposed standard specification for pneumatic tubing was that they had no problems with the standard as it was. E17.52.97.1 - Test Methods (Chairman - John Hamrick) John Hamrick reported on the status of the standard test method tentatively titled "Test Method for Validating Vehicle Data Collection Devices Used for Vehicle Counts & Classification." Many comments were received from the subcommittee members on this draft standard during the task group meeting as well as the subcommittee meeting. The highlights of the discussion are as follows: Change the existing format to conform to ASTM "Blue Book" for standard test methods; Suggested video as the data collection device to use for referee or ground truth data; For the functional aspect of the testing, specify a tester (device used to simulate road tube, piezo, loops, and contact closure sensor inputs) and its performance specifications as well as a procedure for qualifying the tester prior to running a test; The task group will review E867 (Terminology Relating to Vehicle Pavement Systems) to make sure definitions are not duplicated in the draft standard; Another suggestion was to include simple diagrams for the bench and field testing setups in the apparatus section. The subcommittee members also made editorial comments on the standard. Task group members will revise the current draft to incorporate the above mentioned comments. The revised draft will be routed to meeting attendees and other interested members for review. E17.52.97.4 - Revamp E1572 - 93 (Chairman - John Hamrick) The revamping of E1572 - 93, which is the "Standard Practice for Classifying Highway Vehicles from Known Axle Count and Spacing" will include replacing the existing program with a new C-code program developed by the Idaho State Transportation Department. John Hamrick will follow up with the Idaho State Transportation Department to obtain the program for inclusion in the appendix section of the existing E1572. E17.52.97.3 - Traffic Device Interconnect (Chairman - Peter Keen) Luz Elena Y. Mimbela reported for Peter Keen in his absence on the status of the NTCIP Data Collection and Monitoring (DCM) working group. Namely, a letter and a DCM working group quarterly report provided by Peter Keen were handed out for members to review. The DCM working group quarterly report consisted mainly of a draft object tree structure (see attachment 3 for details) that was developed by the group. E17.52.98.1 - Review of E1442 (Chairman - Perry Kent) Perry Kent will review the existing E1442, which is the "Standard Practice for Highway Traffic Monitoring." The group consensus was that the changes needed if any would be minor. E17.52.98.2 - Piezo Sensor (Bill McCall, Chairman) This task group had no activity since the last meeting. E17.52.98.3 - Revamp of E1318 (Perry Kent, Chairman) This task group was formed to revamp E1318-94, which is the "Standard Specification for Highway Weigh-in-Motion (WIM) Systems with User Requirements and Test Method." Dr. Clyde Lee reported on several suggestions of areas where he thinks changes need to be made in order to make the standard more practical for users. The following is an overview of the changes which were discussed: Change speed requirement for both Types II and III to a range of 10 - 80 mph from existing range of 10 - 70 mph to accommodate some states' new speed limits (80 mph); Include an ambient air temperature range for performance requirements,which would consist of the range of -20F to 120F; Maintain the use of the FHWA 13 vehicle classes and add a class 14 to be user defined and a class 15 as unclassified; Remove 3-digit class codes; Coordinate with European WIM standard development already in progress; Recommend continuously reinforced concrete pavement (CRCP) for use at WIM sites; Add minimum skid number requirement; Remove on-site data processing requirements and include only data storage requirements; Suggest minimum length of 150 feet for concrete pads on the WIM system approach and retreat. OLD BUSINESS Ted Gilfert was scheduled to demonstrate the ATSI tester. However Mr. Gilfert was unable to attend the meeting due to an airport fire which caused his flight to be cancelled. Therefore, the demonstration of the ATSI tester will be tentatively scheduled for the December, 1999 meeting. NEW BUSINESS No new business to report! FUTURE MEETINGS December 5 - 8, 1999 New Orleans, LA June 18 - 21, 2000 Toronto, ON Canada December 3-6, 2000 Orlando, FL ADJOURNMENT The meeting was adjourned at 12:00 Noon
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