Idris say they aren't recommending deep loops for tolling yet CORRECTION

Teri England at Idris says the company is not recommending their smart loops be placed at 50mm (2 inches) for tolling purposes because for the moment they don't achieve the required 99.5% classification accuracy for toll collection. Teri England of Idris says the company is working to achieve these accuracies at 50mm (2 inch depth) but isn't there yet. She says there is a demand for loops that can be placed at this depth so they aren't chewed up in milling operations when the wearing surface of asphalt pavement is relaid - which occurs about every eight to twelve years.

For now the deeper arrays are only intended for traffic data collection where less demanding accuracy (95%) is needed.

In an earlier report (see http://tollroadsnews.com/node/3486) we misread an announcement sent out by Diamond Consulting - which developed the Idris system for vehicle classification and sells it internationally.

In tolling applications Idris still needs to be placed at 20mm (3/4 inch) depth. It is usually laid in special concrete pavement at the toll point.

TOLLROADSnews 2008-04-16