DIN CEN ISO/TS 17444-1 DIN SPEC 70136-1:2018-02

Part 1, Metrics, describes a set of metrics with appropriate definitions, principles and formulations, which together make up a reference framework for the examination of the charging performance of electronic fee collection (EFC) systems. These charging performance metrics, specifically charging availability and charging integrity, are intended for use with any charging scheme, regardless of its technical underpinnings, system architecture, tariff structure, geographical coverage, or organizational model. They are defined to treat technical details that may be different among technologies and vendors or vary over time as a 'black box'. They focus solely on the outcome of the charging process - i.e. the amount charged in relation to a pre-measured or theoretically correct amount - rather than intermediate variables, such as positioning accuracy, signal range, or optical resolution.This part of the standard does not propose how the theoretically correct charge is determined, whether by declaration in the case of discrete systems or by another agreed estimation technique for continuous systems. The standard does not propose specific numeric performance bounds, or average or worst-case error bounds in percentage or monetary units. Those decisions are left to the toll charger (or to agreements between Toll Charger and Service Provider), whilst providing a way to be sure that there is a consistent framework for describing system requirements when writing Request for proposals, for system comparisons during acquisition, for test results, for service-level agreements, and ongoing (post-deployment) performance monitoring.This definition is intended to be based on the following principles:- Cover all road charging schemes identified in CEN ISO/TS 17575-1/4 and EN ISO 14906;- Charging performance, not positioning performance or interface and other technical properties ;- Protect the interests of various actors, specifically road users and toll chargers;