Me. Rev. Stat. tit. 23, § 3359

Unless otherwise required in a municipal ordinance or regulation, when any excavation is made in any paved public highway and the pavement is laid on a concrete base, the excavation must have the pavement and concrete cut back on each side of the excavation ditch a distance of 8 inches, and in issuing the permits for cutting the pavement this extra width must be charged to the person applying for the permits.