A bus trap is a road construction or device that only allows buses to pass through.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...p_fullsize.jpg
Previously:
Runaway truck lane - GIF
Bomb truck barrier - GIF
Testing buses in the UK in the 1950s - video
GM Futurliner bus - photos
School bus converted to a rolling store - photo
Impatient driver drives over bollard - GIF
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