TRL was asked to develop a methodology for the assessment of Electronic Toll Collection (ETC). This was undertaken in the absence of any detailed information about the on-board units (OBUs) or their supporting systems from the various consortia involved in the trials. User needs and safety issues were considered to develop a Human-Machine Interaction based checklist (see Part 2) to evaluate ETC OBUs, and a post use questionnaire to subjectively assess systems users' opinions of the OBUs. Some information about user preferences and expectations was elicited via a user preferences questionnaire (see Part 1) which was given to selected staff at TRL. (A) (This report is also included on the TRL CD-ROM entitled "Research on road user charging 1995-1998"). For the covering abstract see IRRD 491340.

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