Maneri Sign Company | Traffic Sign Manufacturing | Gardena California Maneri Sign Company, Highway Sign Manufacturing, gardena california, Traffic Control Signs, Street Signs, Guide Signs, Work Zone Products, Logos Maneri Sign Company has been a leader in the traffic sign manufacturing and services industry. Servicing city, county and state contracts throughout the country. From the largest of government agencies to the general public, Maneri Sign Company continues to deliver quality products and personalized service.