Why over 200 manholes were welded down for the Grand Prix race in D.C.

Why over 200 manholes were welded down for the Grand Prix race in D.C.

The speed limit on Pennsylvania Avenue NW is 25 mph. But this weekend in Washington, racecars will zoom around at speeds as high as 185 mph during the Freedom 250 Grand Prix. The Penske Corp., which owns IndyCar, has put a lot of work into preparing the 1.66-mile, seven-turn course, including havin...

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