ISO 20077-1:2017 defines the concepts and the terms related to extended vehicles.

ISO 20077-1:2017 presents general information regarding these vehicles, specifies the dedicated terminology and describes the interrelation with other standards related to extended vehicles.

ISO 20077-1:2017 concerns:

- road vehicles with four or more wheels designed and constructed primarily for the carriage of persons that are defined as Category 1 vehicles in the United Nations Special Resolution No.1 in TRANS/WP.29/1045, as last amended on 19 June 2012;

- road vehicles with four or more wheels designed and constructed primarily for the carriage of goods that are defined as Category 2 vehicles in the United Nations Special Resolution No.1 in TRANS/WP.29/1045, as last amended on 19 June 2012,

where these road vehicles are still in accordance with the specifications of the vehicle manufacturer.

While this document mentions already standardized interfaces and devices (e.g. external test equipment) connected to these interfaces, the specification of these interfaces and devices is not within the scope of this document.