(Bloomberg) -- Burger King is planning to start a service that delivers its hamburgers to drivers stuck in traffic in Mexico City, Sao Paulo, Los Angeles and Shanghai.

The fast-food giant began a pilot program in Mexico City last month using an app that recognizes voice orders and uses real-time location to bring food to drivers in motion.

Gustavo Lauria, chief creative officer of We Believers, the ad agency responsible for the campaign, said Burger King is still refining the service proposal, including how to avoid some obvious traffic violations observed in the original ad, like navigating between lanes to hand the order to the driver.

Burger King will use Google’s traffic reports to spot heavy jams and to set maps for navigation, Lauria said. One key issue is that the delivery has to be made within a 3-kilometer radius of the customer to guarantee that the burgers and fries arrive hot and that the beverages are cold.

In Mexico, Burger King will use the Rappi platform for deliveries, as opposed to the Burger King-branded delivery motor biker in the video used for communication purposes, Lauria said.

Burger King’s new delivery service for some of the largest cities in the world comes as its owner, Restaurant Brands International Inc., struggles with results. Restaurants in many cities are experiencing less foot traffic and more online and mobile-ordered pickups.

Burger King Mexico general manager wasn’t immediately available for comment.

To contact the reporter on this story: Cyntia Barrera Diaz in Mexico City at cbarrerad@bloomberg.net

To contact the editors responsible for this story: Ney Hayashi at ncruz4@bloomberg.net, Carlos Manuel Rodriguez, Dale Quinn

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