What to know about this weekend’s IndyCar race on the streets of the …

Start your engines. President Donald Trump is transforming the streets around the National Mall in Washington, D.C., this weekend into an IndyCar motorsports mecca for the first time.

IndyCars will zoom around a 1.66-mile track against the backdrop of some of the most iconic buildings in the nation. The main straightaways will be Pennsylvania Avenue and Independence Avenue, where drivers will…