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Originally Posted by GasOLane
Then you haven't been on many major metro rail crossings. Railway crossing lights are automatic, set of by the train crossing a certain point on the tracks. Now assume one train has gone and you start to move under the barriers, then another one comes from the other way BEFORE the barriers have reached the top, and also hidden by the first train... Bingo!
The part I used to like is the "Give way to trains" signs. Like, your gunna argue right of way with something trying to stop on steel with steel wheels?
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It doesn't work that way each track has trip and release sensors at appropriate distances either side of the gate. Those familiar with this Springvale Rd crossing will know that if a train is held pratiing around at the nearby station, the gates can remain down for rediculously long periods of time. The sensors are space far enough away to ensure they would be fully close before a train travelling in excess of 100Kph arrived at the crossing.