On Fri, 06 May 2016 08:17:29 -0600
Arthur Conan Doyle wrote:
Graeme Wall wrote:

A low tunnel in Sydney (I think) has a water curtain with a big no entry
sign projected on it right in front of the driver if a heigh vehicle
passes the sensor.

Yes, pretty cool:

https://www.youtube.com/watch?v=Dk9DjO-_rT8

Doesn't just happen to road vehicles it would seem:

https://www.youtube.com/watch?v=agKwYR8mzzM

--
Spud