Unions representing California workers for Bay Area Rapid Transit, San Mateo County Transit and Alameda County Transit face end of the month deadlines to come up a new contract.
According to news reports in the area, current negotiations are still in the early stages, making two or more simultaneous strikes a possibility.
Such a strike could leave hundreds of thousands of commuters stranded, as about 600,000 people ride the three transit systems daily.
Gov. Arnold Schwarzenegger would have the option to declare a 60-day cooling-off period in case of any labor walkout involving the transit systems.