SAN ANTONIO -- With tens of thousands of people making their way downtown for the Rock 'N' Roll Marathon this weekend, traffic issues are expected.

Several road closures are happening, including exit ramps.

• Exit ramp from 281 to St. Mary's Street: Closed 6 a.m. to 10 a.m.
• Road closure exit 155A from I-35 North and I-35 South to Alamo Street and Downtown: Closed 6:15 a.m. to 9:45 a.m.
• Exit 155C on I-10 to West Commerce Street: Closed 6:15 a.m. to 9:15 a.m.
• I-37 Northbound and Southbound lanes at Exit 140B to Cesar Chavez: Closed 7:45 a.m. to 2:30 a.m.

In addition, more than 60 roads will be closed for the race. Most of those closures will begin at 6 a.m. and end at 3:30 p.m.

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Parking will not be available anywhere along the route.