In the 1930s, with the advent of the automobile, High Street became the A12, the main road through Essex. Ribbon development saw houses sprawl along the road for miles. Ayletts Foundation School closed in 1944, though its building still stands and now houses the Kelvedon Library and Museum. It was replaced by the Kelvedon St Mary's School, a Church of England primary school located on the corner of High Street and Easterford Road (now the Kelvedon and Feering Health Centre and a private residence). It was in turn replaced in 1977 by a new school located in Docwra Road, also called Kelvedon St Marys. This school converted to academy status in March 2013. The village suffered major congestion until a bypass was built in the 1960s diverting the A12 past the village. Suburbanization started to take place in the 1980s when a large development, called Riverside Park, was constructed adding hundreds of homes to the village envelope.