Adrian wrote in
:

Perhaps the driver should have a radar warning device like airline
pilots "Pull up, Pull up"!

Many years ago, there was a low bridge outside my father's office. Near
it was a roundabout served by single and double decker buses, which came
from the same garage and shared a pool of drivers. Regularly, a
daydreaming driver would set off along the wrong road and either hit the
bridge or have to do a 3-point turn in the busy road.

After a while, the council installed a device with a light beam and
sensor, so that when an overheight vehicle passed, it flashed a large
sign saying something like TOO HIGH - STOP, and sounded a siren. The
staff in Dad's office would hear the siren, rush to the window, usually
in time to see the bus hit the bridge.

In those days the council owned the buses and the road, but not the
(railway) bridge. As the accidents were still happening, they decided
to lower the road, which would also allow them to run double-deckers on
that route. This turned out to be difficult job, as there was a sewer
just under the road surface and other services that had to be moved, and
they had to close the road and send the traffic round a long diversion
for many months.

Eventually they reopened the road and at last double deckers could
proceed along it unhindered. Three months later, BR closed the line and
removed the bridge.

Peter

--
Peter Campbell Smith ~ London ~ pjcs00 (a) gmail.com