The Cleveland National Forest Foundation, a small group of environmental advocates, filed a lawsuit against Caltrans on Wednesday over the plans to expand I-5 in the San Diego area.  The lawsuit claims the freeway expansion would lead to “an enormous surge in greenhouse gas emissions.”  Caltrans Final Environmental Impact Report, which was signed on October 23, 2013, states that the express lanes expansion project is the best way to serve the 300,000 daily trips along the freeway by 2030 as it has the least impact on natural resources, requires fewest property relocations, and has the lowest construction costs.