Glossary

Term	Definition
Distance travelled	Total number of vehicle-kilometres (vkm) travelled in one year.
Engine type	Type of engine –­ e.g. petrol, diesel or electric – which drives a vehicle, i.e. a passenger car or road freight vehicle.
External costs	These arise because traffic causes damage to the environment, to health and when accidents occur. They are borne by the general public, by third parties or future generations and are not paid for by the road users who cause them.
HGVC	Heavy Goods Vehicle Charge: Charge for heavy goods vehicles calculated according to total weight, emissions level and kilometres driven.
Intermediate space	The 2012 Urban/Rural Typology of the Swiss Federal Statistical Office divides spatial types into urban, intermediate and rural.
Modal split	Percentage share of a means of transport or a type of transport in the volume of traffic (e.g. distance or tonnes) or of total distance travelled.
On-demand transport services	Services such as buses that operate on demand.
Passenger vehicle, car	Used synonymously.
Person-kilometres	Product of the number of persons and the distance travelled by them.
Inward urban development	Spatial development strategy in which settlement development takes place within already settled areas. It aims to increase the density of use and users in order to slow down urban sprawl. At the same time, it aims to increase the quality of settlement, for example through better recreational and open spaces, and to reduce traffic.
Tonne-kilometres	Product of the transported tonnage and the distance travelled.
Transport services	Sum of the tonne-kilometres (tkm) covered in one year.
Transport use	Sum of the person-kilometres (pkm) covered in one year.
Vehicle fleet	The totality of all vehicles in an organisation, such as a company or state.
Vehicle-kilometres	Product of the number of vehicles and the distance travelled by each vehicle.