Several Allentown roads will close Sunday while thousands of people participate in the annual St. Luke’s Half Marathon and 5K.

The following streets will be closed between 7:30 a.m. and 11:15 a.m.:

• Linden Street (which becomes Parkway Boulevard) between 17th Street and Ott Street

• Broadway between Ott Street and Cedar Crest Boulevard (closure from 8 a.m. to 8:40 a.m. for the 5K)

• Ott Street between Broadway and Hamilton Boulevard (reopens at 9 a.m.)

• Hamilton Boulevard between 21st and 22nd streets (rolling closures after 9 a.m.)

• Yocco Drive

•  Reading Drive/Walnut Street between Yocco Drive and St. Elmo Street

• South St. Elmo Street

• Union Street at the St. Elmo Street intersection

• Lehigh Parkway East between Martin Luther King Jr. Boulevard and Lehigh Parkway North, and Lehigh Parkway North at the entrance to the Lehigh Parkway trail

• Park Drive in the Lehigh Parkway

• Martin Luther King Jr. Boulevard between St. Elmo Street and South Third Street, and the roads that intersect with Martin Luther King Jr. Blvd, which includes the ramps to 15th Street, South 10th Street, Lehigh Street and West Union Street.

Detours will be posted, and police will be directing traffic during the event, according to St. Luke’s. Both events total about 2,000 entrants.

The event is in its 42nd year, and its 15th sponsored by St. Luke’s.