By Al Novack

PHILADELPHIA (CBS) – Southbound Broad Street drivers take note: police have set up a one-block detour that may cause some congestion and back-up at times now through Saturday morning.

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The 40th anniversary of Opera Philadelphia is being celebrated in a temporary ballroom set up in area of Broad Street Southbound between Locust and Spruce Streets.

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Police are detouring southbound drivers around the block and then back onto broad until 9 a.m. Saturday. They warn that at times, there could be some congestion during heavy travel times.

Northbound lanes are open.

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