> Traffic worsened because drivers weren't able to optimize their routes, or even get directions to their destination

During Canada’s Rogers outage in 2022:

> In Toronto there was some dependency on Rogers. One quarter of all traffic signals relied on their cellular network for signal timing changes. The Rogers GSM network was also used to remotely monitor fire alarms and sprinklers in municipal buildings. Public parking payments and public bike services were also unavailable.

https://en.m.wikipedia.org/wiki/2022_Rogers_Communications_o...

As it was summer, I recall some park programming for kids had to be cancelled because the employees were required to have a phone capable of calling 9-1-1 (but sounds like that at least still worked here)