Any commissioners appointed by the supreme or superior court to build or repair a bridge, or lay out, alter, or discontinue a highway, may order the town or towns, in or through which they lay out or alter a highway, to grade the hills to such inclination as they deem proper, and to gravel the portions they deem necessary. The commissioners shall estimate the expense and report to the court. The court may accept or reject the report in whole or in part and order the town or towns to gravel portions of the highway and to grade the hills in the manner and to the extent it deems proper. (Added 1985, No. 269 (Adj. Sess.), § 1.)