ABSTRACT
This chapter reports on the development of a framework of guidance to assist signal sighting committees resolve conflicts to achieve the optimum signal arrangement. Signal sighting is controlled by Railway Group Standards, but in practice the activity still relies heavily on professional judgement on the part of the Signal Sighting Committee members, as standards cannot cater for the contextual uniqueness of particular signal arrangements. Data from the literature review and subject matter experts consultation were collated before developing the tool for managing conflicting signal sighting requirements and the following factors were identified: 45 HF signal sighting principles, reason for priority, and suggested solution. A list of good practice signal sighting principles was developed following an extensive literature review that considered the issues related to signal detection and driver responses to signals. In order to enhance the usability of the framework, a range of signal types and functions was identified.
