[vel0city]

IRT to applying ultra-high bandwidth networks to devices which don't need a lot of bandwidth, the point of moving to a higher bandwidth network is to allow these devices to quickly report back what they want to say and then get off the air faster. The faster they can report their small heartbeat of data, the more devices you can support. Lets assume this traffic light sends a snapshot of the intersection at a frame a second, each frame being 100KB. So, 100KB/s would be is normal load, so there's no real need for it to have a dedicated 100Mbit link. However, if you've got a few thousand devices wanting to share that link space, you're going to need more bandwidth available to the whole. Its also good for the general responsiveness of the network for that 100KB transfer to happen in less time, as only a single device can talk on the network at once. Its the same thing with home WiFi connectivity. 54Mbit would theoretically be plenty of bandwidth for a movie stream and a few phones/tablets browsing social media, but if you're using 802.11g you'll probably have issues with your video stream as those phones and tablets hog the airwaves while they load a batch of images. It takes time servicing multiple devices in the same channel, time that takes away from max effective bandwidth available.

Also, while its true one could just wire up all of these fixed devices, these wiring costs would massively drive up the cost of implementation. Trenching city streets to lay new cables costs a lot of money, just ask Google.

[Johnny555]

You're talking about 802.11g and 100Mbit links, while I was talking about cellular data -- two completely different things.

A cell tower has more than a single channel and a city with a thousand traffic lights is going to have many cells, so using existing cellular generations is not going to run into problems with collisions from 1000 traffic signals trying to send data at once.

[vel0city]

At the basic level these two things are pretty similar. Its the same concept, just a difference in scale. The tower can only slice time so much before clients have to wait longer and longer to transmit. The faster a client can send its burst of data and get off the air, the more clients you can have connected per tower. I've personally experienced plenty of circumstances where even though signal strength is fine, there just isn't enough bandwidth for reliable cellular service.

[Johnny555]

I understand that if a single cell tower is overloaded, then its clients will have issues talking to that single cell tower.

My point is that a city with a thousand traffic lights will be covered by hundreds if not thousands of cells, so the issue of traffic lights competing for bandwidth for a single source is non existent.

And this problem doesn't change for 2G, 3G, 4G, or even 5G. Perhaps 5G can scale better but if you had a single 5G tower covering an entire city, it too would run out of capacity.