Los Angeles Mayor Eric Garcetti announced on Tuesday the details of a data-sharing agreement between the city and a popular traffic mapping cellphone app.

The Waze app is used by more than 1.3 million drivers in L.A. to find routes and report issues to other drivers. Under the new agreement, the city will provide data to Waze from across city departments — including information about road closures, construction and safety hazards — so drivers can avoid blocked streets and congestion.

The mayor also announced Los Angeles will become the first city to provide hit-and-run incident notifications to Waze users driving near the incident in case they have useful information to share with law enforcement. The Los Angeles Police Department will also use the app to put out local AMBER alerts.

“This partnership with Waze matches city data with the latest smart phone technology to get people where they want to go faster,” Garcetti said. “This is exactly what our open data initiative is all about — going beyond information sharing to provide opportunities for our data to transform into tools to make people’s lives safer and easier in very tangible ways.”

Waze is providing the city with aggregated data from the app, including user-generated reports and driving and route data, in a form that ensures no personally identifiable information is shared. This new data stream can be analyzed and eventually used to evaluate the city’s traffic management for events and road closures, assess the deployment of traffic officers, and further refine traffic strategies for the most congested areas, city officials said. The city is already working on how to integrate the collection of user-generated and verified requests into the 311 request system, so the city can respond to incidents in real time.

“We’re thrilled to expand our relationship with Los Angeles, our largest metro in the U.S.,” said Di-Ann Eisnor, head of growth at Waze. “We’re working with the city and the Mayor’s office to better understand what’s happening on the roads and where. We hope this leads to more efficient traffic monitoring and management, reduced congestion, and safer roads for Southern California’s citizens.”