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Visual performance at passive level crossings with long sighting distances

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conference contribution
posted on 2016-05-23, 12:58 authored by Gregoire S. Larue, Ashleigh FiltnessAshleigh Filtness, Joanne Wood, Sebastien Demmel, Anjum Naweed, Andry Rakotonirainy
The third edition of the Australian Standard AS1742 Manual of Uniform Traffic Control Devices Part 7 provides a method of calculating the sighting distance required to safely proceed at passive level crossings based on the physics of moving vehicles. This required distance becomes greater with higher line speeds and slower, heavier vehicles so that it may return quite a long sighting distance. However, at such distances, there are also concerns around whether drivers would be able to reliably identify a train in order to make an informed decision regarding whether it would be safe to proceed across the level crossing. In order to determine whether drivers are able to make reliable judgements to proceed in these circumstances, this study assessed the distance at which a train first becomes identifiable to a driver as well as their, ability to detect the movement of the train. A site was selected in Victoria, and 36 participants with good visual acuity observed 4 trains in the 100-140 km/h range. While most participants could detect the train from a very long distance (2.2 km on average), they could only detect that the train was moving at much shorter distances (1.3 km on average). Large variability was observed between participants, with 4 participants consistently detecting trains later than other participants. Participants tended to improve in their capacity to detect the presence of the train with practice, but a similar trend was not observed for detection of the movement of the train. Participants were consistently poor at accurately judging the approach speed of trains, with large underestimations at all investigated distances.


The authors are grateful to the Australasian Centre for Rail Innovation, V/line, PTV, ARTC and QR for funding and supporting this research. Project No. LC/2.



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Conference on Railway Excellence (CORE) 2016


LARUE, G. ... et al, 2016. Visual performance at passive level crossings with long sighting distances. Presented at: CORE 2016, The RTSA Conference on Railway Excellence: Maintaining the Momentum, 16th-18th May 2016, Melbourne, Australia.


Railway Technical Society of Australasia


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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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Melbourne, Australia

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