A hazard is an “agent” which has the potential to cause harm. In the case of trespass risk, the hazard is the act of trespass that exposes a person to the threat of injury or death causes by the operation of the rail network. These threats include being struck by a train, electrocution and falls from height.

Importantly, although the HAZID process is often informed by historical accident and incident data it should use a range of sources of information, such as site surveys. The HAZID explores the potential for types of trespass and associated harm at a location and not just those that have been reported or recorded as incidents. 

For the purposes of trespass risk assessment, the HAZID process enables information about the trespass threats and hazards to be systematically identified and captured in a formal and repeatable way.

The information from the HAZID should be recorded. One way to do this is using a table within a spreadsheet.

The HAZID template provides a summary of what should be included in a HAZID and provides guidance on how to complete a HAZID what information might be collected and recorded. This template has guidewords and options specific to trespass.

Further guidance on collecting HAZID information is provided on the Collecting HAZID information page.

Guidance is also provided on using incident data to inform a HAZID as well as Risk Analysis.