Quoth Chromatix
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Some years back, my previous carrier picked up near Barrie, and the way out of this customer's site used a "demand light" (only changes to green if a vehicle is on the sensor). Slight problem - a bit "upstream" from this light was a rail crossing (industrial spur), without enough space for a tractor-trailer between the crossing and the light (by the time the trailer was clear of the crossing, the tractor would be fouling the intersection), and there was no sensor "upstream" from the tracks - if you stopped before the tracks, the light wouldn't go green unless another vehicle came along the other direction, and if you pulled onto the sensor, you'd be on the tracks.
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