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BART service is resuming this morning after computer problems prevented trains from picking up any passengers for the first few hours of the morning commute, agency officials said.

Service was resuming at about half-capacity as of 7:15 a.m. with full service expected by 8:15 a.m., BART spokesman Jim Allison said.

Systemwide delays began shortly after midnight because the agency's computer systems were not communicating properly with track switches, Allison said. 

Many commuters were forced to drive instead, snarling traffic on highways throughout the Bay Area this morning.