On Seminary Road, westbound, it looks like some small vehicle cleared portions of the protected bike lane. Oddly, they didn’t clear all sections.
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Casey Kane
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The City’s drawings from the Commonwealth Street Complete Streets Project see page 6, say they are speed cushions media.alexandriava.gov/docs-archive....
nacto.org/publication/... Speed humps are parabolic vertical calming devices intended to slow speeds on low volume, low speed roads. Speed humps are 3–4” high and 12–14’ wide, with a ramp length of 3–6’, depending on target speed.
nacto.org/publication/... Speed tables are midblock calming devices that raise the wheelbase of a vehicle to reduce its speed. Speed tables are longer than speed humps and flat-topped, with a height of 3–3.5” and a length of 22’. Operating speeds for range from 25–45 mph, depending on the spacing.
From NATCO nacto.org/publication/... Speed cushions are either speed humps or speed tables that include cutouts to allow large vehicles to pass unaffected, while reducing car speeds. They can be offset to allow unimpeded passage by emergency vehicles and are typically used on key emergency routes.