Road accidents are measured in terms of the number of persons injured and deaths due to road accidents, whether immediate or within 30 days of the accident, and excluding suicides involving the use of road motor vehicles. A road motor vehicle is a road vehicle fitted with an engine as the sole means of propulsion and one that is normally used to carry people or goods, or for towing, on the road. This includes buses, coaches, trolleys, tramways (streetcars) and road vehicles used to transport goods and to transport passengers. Road motor vehicles are attributed to the countries where they are registered, while deaths are attributed to the countries in which they occur. This indicator is measured in number of accidents, number of persons, per million inhabitants and million vehicles.

Passenger transport refers to the total movement of passengers using inland transport on a given network. Data are expressed in million passenger-kilometres, which represents the transport of a passenger for one kilometre. Components for road and rail are available.

Freight transport refers to the total movement of goods using inland transport on a given network. Data are expressed in million tonne-kilometres, which represents the transport of one tonne over one kilometre. Components for road and rail are available.

Container transport refers to the transportation of goods in standardized re-sealable transportation boxes by rail and sea. Data are expressed in tons and twenty-foot equivalent units (TEU). TEU is based on a container of 20 foot length (6.10 m) providing a standardised measure of containers of various capacities and for describing the capacity of container ships or terminals. One 20 foot container equals 1 TEU.

Passenger car registrations refer to the number of newly (first-time) registered passenger cars (private cars) or vehicles (commercial cars) registered to the authorities. Data are sourced via the European Automobile Manufacturer's Association (ACEA) and measured in number of units. Data are measured as an index with the base year 2015.

Infrastructure investment covers spending on new transport construction and the improvement of the existing network. Infrastructure investment is a key determinant of performance in the transport sector. Inland infrastructure includes road, rail, inland waterways, maritime ports and airports and takes account of all sources of financing. Efficient transport infrastructure provides economic and social benefits to both advanced and emerging economies by: improving market accessibility and productivity, ensuring balanced regional economic development, creating employment, promoting labour mobility and connecting communities. This indicator is measured as a share of GDP for total inland investment and in euros for the road, rail, air, inland waterways and sea components.

Infrastructure maintenance covers spending on preservation of the existing transport network. It only covers maintenance expenditure financed by public administrations. Efficient transport infrastructure provides economic and social benefits to both advanced and emerging economies by: improving market accessibility and productivity, ensuring balanced regional economic development, creating employment, promoting labour mobility and connecting communities. This indicator is measured in euros and shown as components for road, rail, total inland, air and sea components.