We're working with several major employers. One has over 5000 employees on one campus. All their employees can then avoid heading toward the accident scene. At some point, the maintenance of all these devices is going to form a significant part of the district's maintenance budget. If I were a district engineer in another district, that would concern me in looking at a deployment like this.
Dollars are always tight for maintenance folks.
The other fear I'd have as a district engineer is that once you ever start this stuff the public's going to expect to keep it and demand more of it, and you're never going to be able to turn it off. Once the worms are out of the can you can't get them back in. As a result, we designed a network with full redundancy, and it's temperature hardened. If we lose a card we get an alarm at the network management system, but the system continues to operate. If a contractor cuts a fiber optic cable, the system completely reroutes itself within 2 nanoseconds.