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 Emergency Doors that Lock at Speed
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TransportQueen
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5 Posts

Posted - 05/30/2019 :  07:05:15 AM  Show Profile  Visit TransportQueen's Homepage  Reply with Quote
I found an article from Ireland about a safety feature that locks emergency doors when the bus hits a certain speed, then unlocks them when the bus goes below that speed. They implemented this in response to several students who fell or jumped from moving buses, which is a widespread problem in the States too. Have you guys heard of American buses (or any buses) that have a feature like this?

I know FMVSS 217 requires an interlock system, but since it only requires that the bus not START while the doors are locked, I think a feature like this would still comply. I'm just curious if anybody has more information on doors like this, I'd be very interested to see what's out there.

Here's the article for reference:
https://www.independent.ie/life/family/learning/new-doors-wont-open-at-speed-26281983.html

steveinil
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20 Posts

Posted - 06/24/2019 :  05:35:33 AM  Show Profile  Visit steveinil's Homepage  Reply with Quote
I have never heard of it. but i would think it would have to be approved by the state? At least here in IL it have to be.
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Thomas_Bus_Electrical_Engineer
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3 Posts

Posted - 12/10/2019 :  11:15:33 AM  Show Profile  Visit Thomas_Bus_Electrical_Engineer's Homepage  Reply with Quote
I was an expert witness on a case where a student fell out of the rear emergency door and subsequently was killed. An interlock system as described above should have prevented that tragedy. But the interlock would have to be fail safe, ie. upon loss of dc voltage, the door could be opened. This type of safety is more easily implemented on a multiplexed bus with a programmable controller. On buses like Thomas' HDX, EFX, and Minotour, it is much harder because it will have to be wired with relays and wires and there's no more room for more relays and wire in the electrical panels.
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