This document defines metrics for the charging performance of electronic fee collection (EFC) systems
in terms of the level of errors associated with charging computation.
This document is a toolbox standard of metrics. The detailed choice of metrics depends on the
application and the respective context.
This document describes a set of metrics with appropriate definitions, principles and formulations,
which together make up a reference framework for the establishment of requirements for EFC systems
and their later examination of the charging performance.
The charging performance metrics defined in this document 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 can 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 premeasured
or theoretically correct amount, rather than intermediate variables from various components
as sensors, such as positioning accuracy, signal range, or optical resolution. This approach ensures
comparable results for each metric in all relevant situations.
The metrics are designed to cover the information exchanged on the Front End interface and the
interoperability interfaces between Toll Service Providers, Toll Chargers and Road Users as well as on
the End-to-End level.