Local authorities may designate a crossing for senior citizens or disabled persons on any street or highway in the vicinity of a senior citizen housing project, senior citizen nursing home, or residential care facility for disabled persons on the basis of an engineering and traffic investigation prescribed by the commissioner and subject to the uniform specifications adopted pursuant to subdivision 2. Designation of a crossing for senior citizens or disabled persons on a trunk highway is subject to the written consent of the commissioner.
The commissioner shall adopt uniform specifications for crossings for senior citizens or disabled persons. The specifications shall include criteria for determining the need for a crossing and the type and design of traffic-control devices or signals that may be used at the crossing. The specifications shall be incorporated as a part of the Manual on Uniform Traffic Control Devices required pursuant to section 169.06.