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If the two sides can't come to an agreement by Thursday, a strike will bring the transit system to a halt.
Negotiations for a new BART contract crawled ahead today with less than a week left to reach an agreement or face a possible strike.
BART chief spokesman Linton Johnson says that there was been "slow but steady" progress between the transit's leaders and union representatives over the July Fourth holiday weekend.
The unions could declare a strike as early as July 13 and passengers are starting to worry about how that might impact them.
San Franciso's Muni system has already made plans to add more temporary buses and carpool stops to try to help passengers in case of a BART strike.
More than 300,000 riders use BART daily.