Systems Weigh-in-Motion (WIM) WIM System Applications Data Collection
Data Collection
Real-time Volume, Occupancy and Speed (VOS)
Today DOTs and municipalities are providing traffic data to online services that display traffic information for commuters. For these services, the information they are providing from their data collection sites has to be current to be useful – not data from a week ago or even an hour ago. Their systems require traffic information that is continuously updated.
IRD has two products that provide real-time volume, occupancy and speed data:
IRD’s TRS traffic classifiers continuously calculate and make available VOS. The user can set intervals from 5 seconds up to 15 minutes. On a per lane basis, volume is the count of vehicles and the average speed is based on the speeds of all vehicles passing during the interval. Occupancy for each loop is the percentage of time a loop sensor is active during the interval. Data for the last complete interval is made available until the next interval is complete.
IRD’s iSINC™ ITS system electronics can also be configured to provide VOS data in real-time. The iSINC uses a user defined “moving window” interval to calculate the VOS. The VOS values are then transmitted at a rate set by the user. The VOS values are always for the interval immediately prior to the transmission. For example, VOS could be calculated over the last 5 minutes and transmitted every 5 seconds.
In addition to the occupancy and average speed over the interval, the iSINC VOS data can contain multiple volume statistics. The user can select any combination from counts of total vehicles, vehicles by class, well detected vehicles and error vehicles either for the interval or since midnight.
Both IRD’s TRS and iSINC can provide volume, average speed, and occupancy information in real time while continuing to provide normal data collection operation.
For more information on IRD Traffic Data Collection Systems, please visit IRD Counters & Classifiers.
- Advanced Traffic Data Collection (pdf - 268 kb)
- Strategic Partner in Data Collection and Planning Solutions (pdf - 511 kb)
(PDF files require Adobe Reader)
