, one of America’s biggest mobile phone network providers, has entered an agreement with Cellint
enabling it to offer traffic monitoring and analytics to local and state departments of transportation across America. Cellint’s system uses mobile phone signals to determine parameters such as real time speed, travel times and congestion detection and Verizon provides network services for around 35% of the mobile phones in the US.
To implement the monitoring service, each route is driven in order to build a database of call signatures (including directional information) along the road at approximately 250-metre intervals.
Mobile phones on the Verizon that are being used or receive a text, email or other notification will create a signature on the network which can then be cross-referenced with the database to determine its location. The time taken to transition from one section to the next, or another further along the route, provides an indication of speed.
All user data is anonymised and while the systems can work with low traffic volumes, accuracy and reliability increase as the number of vehicles reach 800/hr as the reading is an average of all users in any section.