Active 'Do Not Block Tracks' Sign and Queue Detection System (Poster)

Where a traffic signal controlled intersection is located within close proximity to a railway crossing, traffic queues from the traffic signal may approach or extend past the railway crossing if traffic volumes are high. Vehicles queued across a railway crossing are at significant risk in that if a train approaches, vehicles ahead in the queue can block their ability to move forward to avoid a collision with a train. As such, queuing of vehicles across railway crossings is an important road safety matter. As per the draft Canadian Railway-Roadway Grade Crossing Standards, traffic signal pre-emption by a grade crossing warning system is required where there is 60 m or less between the stop line for the traffic signals and the nearest rail or where there is more than 60m between the stop line for the traffic signal and the nearest rail and the queue from the traffic signal is expected to regularly extend to within 5 m of the rail. Where traffic queues are very long (>100 m), pre-emption may not adequately clear traffic from the track and the need for additional anti-queuing measures should be considered. In 2010, following discussions with Transport Canada and Canadian National (CN), Manitoba Infrastructure and Transportation (MIT) developed and installed an active "Do Not Block Tracks" sign at an at-grade railway crossing where the queuing of traffic across the crossing area had been identified as a potential concern. For the covering abstract of this conference see ITRD record number 201310RT334E.


  • English

Media Info

  • Pagination: 1 p.
  • Monograph Title: 2013 Conference and Exhibition of the Transportation Association of Canada - Transportation: Better - Faster - Safer

Subject/Index Terms

Filing Info

  • Accession Number: 01517945
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD, TAC
  • Created Date: Mar 11 2014 10:56AM