[chbot] Bluetooth and traffic licghts

[Charles Manning]

This has been going on for ages.... pretty well known really. This is also
how Google and others gathers live traffic info.

They're not hacking you or anything like that. You're voluntarily
broadcasting the info and they're just tracking it. They don't listen to or
analyse the inter-device transmissions or attempt to attach to the BT
device. They just listen for the "I'm here" BT beacon transmissions
(similar to the wifi SSID transmissions).

Take off your tinfoil hat....  You already have had machine readable unique
ids on your car for decades. They're called number plates.



On Thu, Sep 3, 2015 at 11:09 AM, Mark Atherton <markaren1 at xtra.co.nz> wrote:

> Hi All,
>
> Just received an interesting document about traffic management in CHCH
>
> Includes the paragraph "Time to destination boards are a recent innovation
> seen around Christchurch arterial routes. The system is leased. There are
> 200 sensors around the main routes that look for in car Bluetooth
> transmissions. The MAC address is noted and when the same MAC address is
> detected further down the road, the time between readings is used to
> calculate travel times. Have a look at Transport for Christchurch.
> http://www.tfc.govt.nz/"
>
> Scarey, or what ...
>
> - Mark
>
>
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