TERRA provided 24-hour machine traffic counts for on- and off-system routes throughout IDOT Districts 3, 4, 5, 6, 7, 8 and 9. These districts include municipalities such as Peoria, Quincy, Carbondale, Effingham and Springfield as well as the Illi-nois portion of the St. Louis Metropolitan Area.

Counts were administered using portable traffic data collectors such as Hi-Star 97, NC-200 and NC-300 magnetic traffic lane sensors, Diamond TT4 road tube counters and MioVision Automated Traffic Data collection cameras.

Data was compiled into weekly submittal spreadsheets including volume and classification, where applicable. Raw count data from the magnetic counters and Miovision was submitted to IDOT weekly. Count data was verified against historic trends before submitting to IDOT.

Field technicians also used on-board laptop computers to collect and compile GPS data using ArcPad software. GPS data was loaded into ArcMap and integrated with collected traffic data which was then integrated into ArcGIS and sent to IDOT in the weekly submittals.

TERRA began working with IDOT on this project in 2006. This contract added the Metro-East area of suburban St. Louis to TERRA’s traffic count responsibilities, as well as introducing newer technology using Miovision traffic collection cameras rather than traditional electronic or road tube counters.

TERRA’s current two-year contract (2014-2015) includes approximately 9,000 count locations in Districts 3, 5, 7 and 9.

TERRA is always on the leading edge of innovation and bringing new ideas to more efficiently gather knowledge about IDOT’s infrastructure and usage.

esri Silver Tier Partner


Client, IDOT