In Sweden, Ambulances testing system to jam car radios

(Source: BBC News via Richard Langley)

Ambulances in Stockholm are testing a system that interrupts in-car audio systems to warn drivers that they need to get through.

The solution was developed by students at the KTH Royal Institute of Technology in the city.
It broadcasts a voice warning, while a text message also appears in the radio display.

It uses an FM radio signal to jam drivers’ speakers and stop music playing.

It will only be able to alert cars that have their radios turned on. It can also interrupt CDs and music connected via Bluetooth.

The radio transmission is sent from the emergency vehicle to nearby FM tuners that are equipped with RDS, a communications protocol for embedding small amounts of digital information in FM radio broadcasts. It is most commonly used to display the station or song title.

[…]The city will begin testing the system in a limited number of ambulances and fire engines, with plans to expand across the country later this year.

The warning system can work out how far in advance messages need to be heard depending on the speed of traffic.

Continue reading at BBC News…

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5 thoughts on “In Sweden, Ambulances testing system to jam car radios

  1. Tom Servo

    A system to jam every available FM frequency at once? To quote a newsman named Buzz Burbank, “What could *possibly* go wrong?”

  2. Ed McCorry

    Having driven emergency vehicles for 40 years and having idiots not get out of your way when your trying to get by, I think it’s a great idea. I’m sure many of them just don’t hear the siren because their music is up loud enough for the next two lanes of traffic to hear. So maybe something like this will help get their attention and I’m sure all the other first responders will agree.

  3. Edward

    It would need to transmit a strong signal on the IF frequency or on many frequencies simultaneously.
    I doubt that it would work.


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