Data reveals that the introduction of Burger King’s meat-alternative patties increased traffic at the global fast-food franchise both during city-specific testing as well as after a nationwide rollout. Researchers at Barclays studied the ratio of traffic share between Burger King restaurants in St. Louis and locations nationwide during the company’s trial phase of its new Impossible Whopper, a plant-based burger produced by Impossible Foods. Burger King began testing the new burgers exclusively at St. Louis locations in April.