Recommendation: 2022003-11

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Ref # 2022003-11
Status Open / In progress
Occurrence Trend investigation into Signals Passed At Stop on the Luas network
Occurrence Date 03 January 2020

Basis for Recommendation

Despite the Signal Passed at Stop (SPAS) events being categorised by Transdev Dublin Light Rail (TDLR), they are not “ranked” in terms of their risk severity. The RAIU consider that risk ranking the SPAS events on the Luas network would give a clearer indication on the severity of the SPAS (likelihood of an accident and its potential consequences) and an indication as to the variations of SPAS risk over time; which, in turn, could be used to allocate resources for investigations. As a result, the RAIU make the following safety recommendation:


Transdev Dublin Light Rail (TDLR) should introduced a Signal Passed at Stop (SPAS) risk scoring process for high-risk SPAS events on the Luas network, to ensure that the severity of a SPAS can be measured (best-practice should be applied if available). This scoring process can be used to assess if risks associated with the SPAS conform to TDLR risk acceptance criteria and are as low as reasonably practicable (ALARP). The scoring process will also ensure that correct system interventions are applied, where required.