The three-word theme for Manteca this summer: Road work ahead. Caltrans as well as the City of Manteca have shifted into overdrive with road construction and maintenance projects since the unusually long rainy season ended.Caltrans has the most high profile work underway along the six-mile long 120 Bypass between Highway 99 and Interstate 5. It is being prepared for an asphalt overlay.“This type of project preserves the pavement and retards future deterioration and is typically applied to pavement in good condition having significant remaining service life,” noted Zelie Nogueira, Caltrans District 10 chief executive of the services branch in an e-mail.