Data lovers can now nerd out on a new website that collects Bay Area transportation data and puts it into customizable maps and charts to play with. Vital Signs is part of an effort by the Metropolitan Transportation Commission to make its performance measures and data more accessible to the public. It also lays the groundwork to measure the effects of Plan Bay Area, which was adopted in July 2013 after a state law mandated each region to produce a plan for smart growth oriented around transit.