Source: South Africa News
This shows what'd happen when you miss the simple things. Police installed SIM cards in the traffic lights in SA and criminals saw it as an opportunity for free phone calls.. Next, 400 traffic lights went off and criminals started to enjoy unlimited calls.
The high-tech traffic lights scattered across the city use a sim card, modem and GPS system to send and receive information. The components were ripped out by the criminals from the traffic lights and used to make unlimited calls that have cost JRA a lot of money.
First and foremost, they could have soldered the simcard or hard-configure so removing SIM is not an option. Second, disabling the voice & data would help to discourage the motive. Imagine, if the central traffic servers are as secured as this SIM card, criminals could just take one SIM card and access the backend with relative ease. Hope the TELCO guys and JRA would learn from this and ensure proper config next time. If you think again the consequences can be disastrous.
In Singapore, I know some government organizations are using and seriously looking in to massive deployment of M2M. IMO, the setup would be quite similar to my suggestion above.i.e. a Private APN with secured backend DMZ server. Even the SIM cards can be custom made if the volume is huge.
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