UPDATE 9:30 A.M.: All lanes of southbound U.S. Highway 101 in San Mateo have been reopened after a debris spill caused traffic delays Thursday morning.
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UPDATE 8:58 A.M.: A severe traffic alert was in effect for U.S. Highway 101 in San Mateo Thursday morning due to debris blocking southbound lanes, according to 511.org.
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The traffic alert was in effect just before Poplar Avenue.
The two right lanes were blocked as of 9 a.m. for clean-up. Motorists were advised to expect delays and avoid the area.
Find out what's happening in San Mateowith free, real-time updates from Patch.
There was no estimated time to reopen the roadway.
Patch will update this story when more details become available.Keep up with San Mateo Patch!
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