[identity profile] ringrose.livejournal.com 2012-06-20 06:14 pm (UTC)(link)
I'd worry about false positives there when a bus is loading passengers near the exit.

[personal profile] ron_newman 2012-06-20 06:22 pm (UTC)(link)
True, it would need to be set up so that the light triggers only when the bus passes beyond a certain line.