Key events in the 710 Freeway extension battle:
1951: California Legislature maps out the first route.
1964: Route modified as the "Meridian route," the first of three modifications through South Pasadena.
1973: South Pasadena and allies win an injunction blocking the extension pending an environmental study.
1989: National Trust for Historic Preservation declares South Pasadena one of America's 11 "endangered places" and indicates it would join the court fight against the extension.
1992: Gov. Pete Wilson's administration announces it will try to get the injunction lifted and build the extension. The federal government accepts the final version of the state's several environmental impact reports.
1998: The Federal Highway Administration approves the project based on the final version, but South Pasadena and allies go back to court and, the next year, win another injunction.
2003: The Bush administration rescinds its support of the court-stalled project, saying the data are outdated and require a new environmental study. Transportation officials begin revisiting the possibility of a tunnel, an idea earlier rejected as not feasible.
2006: Three possible routes are proposed for twin 4.5-mile tunnels to connect the 710 with the 210 after a Metropolitan Transportation Authority preliminary survey deems such a project feasible.
2009: Caltrans and the MTA begin a tunnel technical study of underground conditions along several additional possible routes to determine which, if any, are feasible.
Source: California Department of Transportation and Times research
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