How Iteris Ensures the Reliability of Its Speeding Analytics Data

As probe data becomes increasingly central to the way agencies track changes in traffic over time, the question of whether this data is trustworthy is a fair one. Iteris’ traffic analytics solution ClearGuide® leverages ClearData®, a powerful probe database built from over one trillion GPS data points, available across all roads in North America.

In the case of ClearGuide Safety’s speeding analytics module, for example, this comprehensive data set enables ClearGuide to accurately quantify the individual speeds and overall number of vehicles in a sample size, to precisely determine roadway segments at the highest risk of speed-limit violations.

Conventional traffic-speed probe data provides average speed and travel times, suitable for identifying bottlenecks and congestion points, but is insufficient for pinpointing where, how frequently, and by how much individual vehicles regularly exceed the speed limit. ClearGuide Safety users can run reports that:

• Find segments exceeding the speed limit by a desired margin
• Rank segments based on speed violation
• Generate color-coded maps to identify safety hotspots
• Do before and after analysis
• Apply filters based on: time of day day of week specific corridors and regions

It’s well established that human-powered speeding snapshots using radar are time consuming, expensive, fixed in only one point in time and space, and almost always reliant upon anecdotes and best-guesswork regarding where to place the patrol officer along the corridor. And while it is theoretically possible to collect 24/7 data with the installation of fixed radar sensors, law enforcement infrastructure is not procedurally set up that way. More to the point, there is no need to be; ClearGuide Safety offers 24/7 GPS probe data for everywhere along the roadway and with no investment in infrastructure at all.