The Netherlands is one of the most densely populated countries in Europe. Despite the excellent road network, The Netherlands is confronted with this density on a daily basis: the negative impact of traffic jams and incidents on travel times is growing by 38% the next 5 years. VIA NOVA will lay the necessary foundation for the next step of technological developments to overcome these negative impacts of congestion in future. This next step in technological developments is called Talking Traffic. Vehicles will communicate directly with the infrastructure and other road users and vice versa. The potential with respect to congestion reduction is big, because traffic can be managed more directly. To reach this potential, Talking Traffic relies to a large extent on (big)data already available in modern cars: data of sensors, navigation, etc. However, the problem is data usage in terms of quality and variety among car-brands. The partners stressed the fact that besides technical requirements: data deployment quality, code of practice and a guideline, research should also address business requirements. Without a clear view on quality variations and demands with respect to quality, the data cannot be used effectively. VIA NOVA researches the following issues, * quality and quantity of data from cars * needed quality and quantity of data from cars in Talking Traffic use cases * big data analysis tools to interpret large quantities of data * business models, privacy and security of data from cars The outcome enables users to judge whether data from cars can be useful to solve specific traffic related problems, which data is than to be used, which quality of data is needed and finally the quantity of the needed data. With this measure Talking Traffic can be deployed more effectively resulting in more reduction of congestion.