Courtesy Raul Leal,  LAREDO – Effective today, March 17, 2011 from 9 a.m. to 4 p.m., alternating lane closures will be effect for southbound Loop 20 between McPherson Ave. and International Blvd. for milling of roadway by the Texas Department of Transportation Laredo Maintenance crews.  DRIVE WITH CAUTION: Please SLOW DOWN and MERGE to open