This report examines issues relating to the arrival of massive, often real-time, data sets whose exploitation and amalgamation can lead to new policy-relevant insights and operational improvements for transport services and activity. It is comprised of three parts. The first section gives an overview of the issues examined. The second broadly characterises Big Data, and describes its production, sourcing and key elements in Big Data analysis. The third section describes regulatory frameworks that govern data collection and use, and focuses on issues related to data privacy for location data.