Yosemite National Park in California would be returned to a more wild, less developed, condition under a plan outlined yesterday by Interior Secretary Bruce Babbitt. The plan — which follows 20 years of battles over the future of the park and is now open to public comment — would scale back parking and remove some development, while expanding a shuttle bus system to ferry day visitors in from lots at three main park entrances. Babbitt estimated that the changes would cut traffic flow by 60 percent. On busy summer days, the park is currently inundated by 7,000 cars. Babbitt: “This is not about turning people away from their parks. It’s not that there are too many people in Yosemite; it’s that there are too many cars.” Enviro groups gave the plan mixed reviews.