In a cease and desist letter sent Saturday, the New York City Police Department (NYPD) demanded that Google stop sharing the location of Driving While Impaired (DWI) checkpoints on its navigation app, Waze. In the letter, signed by department’s acting deputy commissioner for legal matters, Ann P. Prunty, the NYPD explained that under the city’s Vision Zero initiative its trying to eliminate all traffic fatalities and “paramount to the success of this initiative” is the police enforcing all DWI laws.

An app designed to help drivers avoid traffic proved helpful during a recent deadly flood. Traffic data from Waze helped government officials and first responders in Louisiana during Baton Rouge’s flooding in August. Esri announced a partnership with Waze and local governments on Oct. 12 to encourage more states and cities to use roadway data for similar projects.