Negotiations between BART and its workers have hit a bump, as the agency accidentally included a certain provision in the tentative contract. The provision, which could cost BART up to $44 million in a four-year span, would allow workers up to six weeks of paid leave per year to handle health and family issues. At the moment, employees must use their sick days or vacation when they take time off to deal with such issues with pay. Two strikes have affected the Bay area this year. Nearly half a million people travel via BART each weekday, and both the agency and employees are working on coming to an agreement.