On Thu, 28 May 2020 16:29:20 -0500, "Byker" wrote:

"Bob (not my real pseudonym)" wrote in message
.. .

Newer trollies have a noise maker built in.

Which people will get so used to hearing that they'll ignore them. Ever been
to a construction site where backup-warning horns are constantly going off?
Before long nobody is paying them any attention...

Sadly, too often a self-correcting problem...

Might be why our light rail trains have the most annoying, really bad
recording of bells played through huge, crappy speakers. Impossible
to ignore.