Springs Branch
Established Member
In Port Adelaide, South Australia, the Birkenhead Bridge is a bascule road bridge dividing two parts of the navigable harbour.There are railway style semaphore signals on the Redcliffe Bascule Bridge in Bristol.
On top of two elevated control cabins which control the raising of the bridge are two railway-style upper-quadrant semaphore signals. This pair of semaphores - one applying to each direction of travel - signal stop or go to river craft needing to pass through the bridge.
The signals are actually three-position American-style semaphores (which were the type in use on South Australian Railways at the time the bridge was completed in 1940).
Those signals do have a "yellow" spectacle lens, but I'm not sure whether they are capable of displaying a 45° indication, or just horizontal (stop) and vertical (go).
Source: Wikimedia Commons, by Peripitus. Reproduced under Creative Commons licence CC BY-SA 4.0
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