364.24  Traffic light synchronization.
  After July 1, 1992, all cities with more than three traffic lights within the corporate limits shall establish a traffic light synchronization program for energy efficiency in accordance with rules adopted by the state department of transportation. The state department of transportation shall adopt rules required by this section by July 1, 1990. This section does not require that a city replace lighting, which has not completed its useful life, in order to comply with the requirements of this section. However, all lighting shall be replaced, whether or not it has completed its useful life, by July 1, 2001.
89 Acts, ch 297, §7; 91 Acts, ch 253, §15