The Philadelphia Marathon returns this weekend with tens of thousands of runners planning to take part in one of four races across the city, which could complicate commutes starting Friday.

The city has announced the dozens of anticipated road closures, detoured SEPTA routes and parking restrictions from Friday through Sunday. Travelers are recommended to allow for extra time for their commutes, use public transit when possible and sign up for the city's event alerts to keep track of changes.

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Event organizers expect around 37,000 participants to take part in this year's races, which include the Dietz & Watson Philadelphia Half Marathon and Rothman Orthopedics 8K on Saturday, and th

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