(concurring). I join in both the rationale and result of the Chief Justice’s opinion, with the understanding that it does not preclude the application of MCL 691.1402; MSA 3.996(102) in cases alleging a failure to "repair and maintain” installations that are integral to, if not part of, the "improved portion of the highway designed for vehicular travel,” such as traffic lights and signs. See ante, p 637, n 29.