The Highways Agency in the UK is tracking the movement of motorists through their mobile phones and satellite navigation systems, reports The Telegraph newspaper. It is collecting the data as part of a project to monitor traffic flow and ease congestion. This data is being passed on by mobile operators and other companies to help the Agency identify areas of heavy traffic and help drivers avoid them. The Agency insists that all data received and processed is anonymous. However, privacy campaign group Big Brother Watch said the project raises questions about the extent to which people's movements were being monitored and their personal data used without their knowledge.