There are smart traffic signals all over the U.S. and metro Atlanta, but this one in Peachtree Corners is the first and only running on 5G.

The free Travel Safely app runs in the background when you’re driving and gives audible alerts for upcoming traffic signals.

Peter Ashley, of Applied Information, said the company started testing its Travel Safely app in Peachtree Corners this week, running it on T-Mobile’s 5G network.

“We can definitely see a significant difference,” he said.

The app also runs the city’s self-driving shuttles, to tell the signal to give the shuttle a green light. Everything is controlled from its network operations center, which can “monitor, watch, collect the data coming off of them,” Ashley said.