A proposed zoning bylaw regulating the location of medical marijuana dispensaries in town is among a number of zoning measures developed by the Planning Board that are expected to come before the May 5 annual Town Meeting. The medical marijuana bylaw would allow dispensaries along a section of Main Street that runs roughly from Capitol Avenue to Old Boston Road. The other proposed bylaws include measures to revise the town’s flood plain district; and to allow for and regulate the location of solar energy facilities in town, according to Steven Sadwick, the town’s community development director. As many as eight zoning proposals sponsored by private residents may also come before Town Meeting. Included are three that would revise bylaws relating to automotive uses, one that would rezone land on Livingston Street from residential to heavy industrial, one that would allow more flexible site design in an existing office research district, and three that would make technical changes to rules governing accessory or in-law apartments. The Planning Board intends to hold a public hearing on all the zoning proposals, tentatively scheduled for April 7.