Will other companies follow Amazon’s lead? That’s a key question for the future of downtown Seattle as the tech giant brings workers back to the office five days a week, as part of a new mandate that goes into effect Thursday.

Amazon has demanded that all of its employees return to the office full-time, five days a week. Now, as those workers head back to the office, officials in the company’s home base of Seattle are warning that the policy may clog up local traffic routes.