PHILADELPHIA (CBS) — Numerous road closures and detours are in effect across the city today in connection with the 22nd annual Philadelphia Marathon.

Some of the major roadways impacted include the Ben Franklin Parkway and the I-676 off-ramps at 22nd Street (westbound) and 23rd Street (eastbound).

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City officials are warning drivers to expect delays and they are advising motorists to use alternate routes, avoid areas along the race course, allow for extra driving time and proceed with caution. Due to increased security in the Parkway area, parking and traffic regulations will be strictly enforced. Street closures are implemented on a rolling basis and will occur as runners go by. Officials are also urging motorists to refrain from double-parking to avoid congestion.

The following streets are affected across the city:

  • 18th Street, from Arch to Callowhill streets
  • 19th Street, from Arch to Callowhill streets
  • 20th Street, from Arch to Callowhill streets
  • 21st Street, from Spring Garden to Arch streets
  • 22nd Street, from Spring Garden to Arch streets
  • Benjamin Franklin Parkway, from 22nd to 16th streets
  • Arch Street, between 16th to 4th streets
  • 4th Street Arch to Vine streets
  • Race Street, from 4th Street to Columbus Boulevard
  • Columbus Boulevard (Southbound lanes), Vine Street to Washington Avenue
  • Southbound off-ramp, from I-95 at Washington Avenue
  • Washington Avenue, from Columbus Boulevard to Front Street
  • Front Street, from Washington Avenue to South Street
  • South Street, Front to 6th streets
  • 6th Street, Bainbridge to Market streets
  • Chestnut Street, 6th to 34th streets
  • 34th Street, Chestnut Street to Girard Avenue
  • Lansdowne Drive, Girard Avenue to South Concourse Drive
  • South Concourse Drive, Lansdowne Drive to West Memorial Hall Drive
  • West Memorial Hall Drive, South Concourse to Avenue of the Republic
  • Avenue of the Republic, West Memorial Hall Drive to Centennial Circle
  • Black Road
  • Martin Luther King Drive
  • Kelly Drive
  • The Falls Bridge
  • Ridge Avenue, Schoolhouse Lane to Manayunk Avenue
  • Main Street, from Ridge Avenue to Green Lane
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A number of SEPTA bus routes are also being detoured. Riders can check the status of their bus on the transit agency’s website.

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All streets are scheduled to be reopened by 6 p.m. on Sunday.