The Bloomberg Cities Idea Exchange aims to help local governments pool resources and share ideas on tough issues.

Transportation Secretary Pete Buttigieg says the U.S. must address its maintenance backlog on rails, roads and bridges before testing out new technology "for its own sake."

"If anyone breaks on the security chain, you’re vulnerable," Jeanne Holm, Los Angeles' deputy mayor for budget and innovation, said during an online conference.

The vice president told a smart cities conference that mayors around the U.S. are supporting the Biden administration's $1.9 trillion relief package.