senator liu authored sb 64 (2015) to require the california transportation commission to review updates to the california transportation plan and prepare recommendations to improve the statewide integrated multi-modal transportation system. these changes will reduce greenhouse gas emissions, increase sustainability, and help prepare the state transportation system to deal with long-term climate change. this bill is part of the senate's california climate leadership package, and is a follow-up to sb 391 (liu, 2009).