When a state trunk highway route is so located that in order to properly connect the designated objectives it is advisable to construct and maintain the highway across a portion of an adjoining state, the commissioner is authorized to expend trunk highway funds therefor in the same manner as other expenditures for trunk highway purposes are made. No such highway or portion thereof shall be established or constructed in any adjoining state until the adjoining state shall first pass legislation consenting thereto and granting the commissioner necessary jurisdiction over the portion of the highway located in the adjoining state.