The CLARS Platform, an EU-funded scheme supporting public authorities to develop urban access regulation schemes, has a public website that provides information for vehicle operators on existing and confirmed Low Emission Zones (LEZs) and urban road-charging schemes in Europe, as well as most other access regulations. 

A map helps users search for individual European cities and see which LEZs, Urban Charging Schemes and Major Access Regulations are active in those cities. The website also includes explanations of different regulations and a guide to relevant EU policy.

The International Transport Forum homepage provides a good selection of different transport statistics.

It collects data relevant to a range of transport policy issues, as well as maintaining historical databases and publishing analyses and indicators regarding the transport sector.

Topics cover all kinds of transport, including economic, environmental and safety issues. Its focus lies in both road and passenger transport.

The Eurostat online section for transport contains general data on passenger and freight transport for air, rail, road and water transport. Most of the data are also available in the EU Transport in Figures: Statistical Pocketbook of the European Commission.

A big advantage of the Eurostat databank is the possibility to get regional statistical data for federal states and metropolitan areas of the EU member states.

This site contains a compilation of panel survey results about mode choice for German and international cities, administrative districts and rural areas. Data is often available for several years.

The EPOMM project's TEMS tool also shows the transport modal split of many cities in the EU.

The European Environment Agency (EEA) provides a useful collection of different data concerning both transport and environment in a large field of activity, including accessibility, energy efficiency, land use, fuel consumption, transport demand, taxes, air quality, external costs, capacity of infrastructure and traffic noise. It also provides outlooks and trends for selected indicators.

Air Quality in Europe provides data for the roadside and background air quality situation in European cities in a comparable and easily understandable way as all detailed measurements are transformed into a single relative figure: the Common Air Quality Index (or CAQI).

Three different indices have been developed to enable the comparison of three different time scales: