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What are the speakers on drawbridges for?

Posted: Thu Jun 16, 2022 4:23 pm
by Kasey
I’ve been looking at drawbridges for traffic lights and sirens, and a lot of them have speakers on them. What are they used for?

Re: What are the speakers on drawbridges for?

Posted: Thu Jun 16, 2022 7:50 pm
by SentrySterling
Most of the time they sound for when the bridge moves
Like at the Fort Maddison Swing Bridge in Iowa, they have 2 Sentry F-2 that sounds when the bridge moves.
Hope that helps!

Re: What are the speakers on drawbridges for?

Posted: Sat Jun 18, 2022 12:55 pm
by Kasey
SentrySterling wrote:
Thu Jun 16, 2022 7:50 pm
Most of the time they sound for when the bridge moves
Like at the Fort Maddison Swing Bridge in Iowa, they have 2 Sentry F-2 that sounds when the bridge moves.
Hope that helps!
Thank you! Do you have a video of this?

Re: What are the speakers on drawbridges for?

Posted: Sat Jun 18, 2022 6:36 pm
by SentrySterling
Fort Madison timestamp is 2:14
https://www.youtube.com/watch?v=1k7ZVLo07yA
Here's also a video of the Interstate bridge as well
https://www.youtube.com/watch?v=fmJAWxwvpPo.

Re: What are the speakers on drawbridges for?

Posted: Mon Dec 19, 2022 5:31 am
by Sentry88
I've been under many drawbridges and not seen bells and speakers rather than just speakers;

Re: What are the speakers on drawbridges for?

Posted: Fri Dec 23, 2022 3:25 am
by SirensOfAustralia
Kasey wrote:
Thu Jun 16, 2022 4:23 pm
I’ve been looking at drawbridges for traffic lights and sirens, and a lot of them have speakers on them. What are they used for?
I believe these are bridges that split in half and rotate around to make way for all kinds of boats that have to pass through. I'm assuming that's what you're looking at. They are used to notify/warn the public that the bridge is rotating or splitting in half to make way for tall boats to move through.