LOS ANGELES (CBS) — If you thought driving into downtown Los Angeles was already a headache, your aspirin supply is going to get a serious dent for the rest of 2011.

Caltrans plans to close a major on ramp for the remainder of 2011 and not expected to reopen it until Summer 2013.

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Did someone say detour?

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Starting this Sunday at 10 p.m. Catrans will close the 11th Street on-ramp to the northbound 110 (Harbor) Freeway. Caltrans previously closed the Olympic Boulevard off-ramp from the Southbound 110 Freeway.

The project is expected to cost $125 million and will … eventually … ease traffic congestion.

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For detour information, click here.