Bradshaw Crossing isn’t just a bridge.It is a symbol of a new world.Those who cross it will enter the future of not just Lathrop but Manteca and Tracy as well.It is a bridge to South San Joaquin County 2.0.Over 100 people were on hand Thursday to help dedicate the $17 million initial span connecting east and west Lathrop or, more specifically the planned community of River Islands at Lathrop with the rest of the City of Lathrop.They were dedicating more than a bridge. In more ways than one the bridge — as well as the 11,000-acre River Islands endeavor that Lathrop Mayor Sonny Dhaliwal astutely noted is one of the largest planned communities ever in California — represents the new South San Joaquin County.The area’s status as a bedroom community of the cradle of technology and The City built on 48 hills on the other side of the Altamont Pass where summers are cooler and the economy sizzling has long been established. But what is now happening are the three cities — Lathrop, Manteca, and Tracy — are on the cusp of starting to come into their own as legitimate communities of the greater Bay Area region.The dynamics ate changing.