On Saturday, spectators flocked to the heart of Washington, DC, to see the opening day of the Freedom 250 Grand Prix, a two-day street racing competition whose roaring engines will reverberate through the city's neoclassical national museums and the surrounding US Capitol.

A broad black-and-white checkered flag band overshadows the more ordinary stripes of a neighboring crosswalk on the section of Third Street that will be used as the start and finish line, which is painted cobalt blue. To safeguard fans who have gathered to see the sleekly constructed vehicles fly past at speeds of up to 180 miles per hour, large metal fencing stands have been erected around the location.

The celebrations on Saturday are a prelude to the main race on Sunday, which President Donald Trump is expected to attend, according to the White House, with a number of preliminary races scheduled. The 1.66-mile course concludes a summer of festivities honoring the country's 250th anniversary.

Less than a year after Bud Denker, president of Penske Corporation, proposed the event, which is anticipated to draw close to 300,000 spectators over two days, the president expedited the race with an executive order in January, avoiding local bureaucratic obstacles.

Around 8 a.m., as the racing teams were getting ready for the first practice rounds, spectators started to come into the expansive racing area under a light drizzle. Hard-core racing enthusiasts who traveled from all across the nation for the Grand Prix in Washington, DC, were unfazed by the weather.

Tom Lantz attended the event with his family, which included his 12-year-old son, Levi Steele, from Altoona, Pennsylvania. Levi had never attended a race before, but Lantz had.

Levi remarked, "I'm just glad I'm here."

The racetrack begins on 3rd Street, which is the National Mall across from the Washington Monument. It then makes turns into Pennsylvania Avenue, which is the street where the White House is situated. After that, it travels down 9th Street, passing the National Archives and the National Gallery of Art. Because Pennsylvania Avenue was wide enough to accommodate a pit lane where IndyCars would stop for tire changes, fuel, and repairs, it was essential to the track.

After that, the race bisects the National Mall by going onto Constitution Avenue and cutting across 7th Street before turning onto Independence Avenue and passing the Smithsonian Air & Space Museum. After that, it makes seven turns and travels less than 1.7 miles until turning onto Maryland Avenue and returning onto 3rd Street.

In honor of the country's semi-quincentennial, drivers will compete in a 250-mile race around the monuments on Sunday for 147 laps, a symbolic number.

Even if they don't attend, many people in Washington, DC, will be impacted by the marathon because authorities have planned significant parking and traffic restrictions for the entire city. Additionally, the Federal Aviation Administration said that, although those timings may vary, flights out of Ronald Reagan National Airport will be suspended on Sunday from 10:15 a.m. to 1:15 p.m.

A Freedom 250 Grand Prix event ticket is required to enter a handful of the city's famous Smithsonian museums that are in the race's path. In order to prevent visitors and its art treasures from being harmed by the race, the National Gallery of Art, which is located adjacent to the pit lane, said it carried out a "extensive vibration study" and implemented a number of safety precautions.

The Freedom 250 will not be the first race to honor America's anniversary in Washington. According to the White House Historical Association, President Thomas Jefferson held a horse race close to the site of IndyCar's track in 1801 to commemorate America's 25th birthday.

It was a little more difficult to host this race than it could have been in the past.

The Grand Prix posed special difficulties for a nation's capital that often does logistical stunts for occasions like the presidential inauguration, such as fixing streets, building massive, heavy fencing, and obtaining licenses to hold the race downtown.

Denker's team used silicone to smooth over almost fifty manhole covers prior to Saturday's qualifying races in order to prevent the high-speed cars' suction from blowing the covers off their locations.

With the president and numerous members of his cabinet scheduled to attend the Grand Prix on Sunday, security will be a major source of contention. Similar to TSA-style screening before to a flight, attendees will be sent via tall magnetometers.

DC municipal officials had requested that the event be classified as a National Special Security Event by the federal government. This designation is only given to the most prominent and dangerous events in the country, like state funerals and the State of the Union. The proposal was turned down by the Trump administration, which chose to go with a Special Event Assessment Rating Level 1, which is the highest classification below a National Special Security Event.

Making accommodations for DC residents who live in the center of the action presented another difficulty for the organizers. Denker, the president of Penske, met in May with locals who live or have offices close to the course to present his strategy and address any issues over noise and disturbance.

The majority of the race's massive construction was completed over the nite, which infuriated locals who were upset about the significant interruption to downtown Washington, DC.

The over $35 million price tag, which is entirely funded by IndyCar, is a wager on the event to draw in new spectators and celebrate the birthday of the country.

Denker stated, "Celebrating our nation's 250th anniversary in ways no one ever expected to see is what's primary for me, and it sounds corny."