Traffic control; speed restrictions; establishment of speed limits; revise procedure and limits. Amends secs. 320a, 606, 608, 609, 610, 627, 627a, 628, 629, 629c, 633 & 721 of
1949 PA 300 (MCL
257.320a et seq.); adds sec. 30a & repeals sec. 629b of
1949 PA 300 (MCL
257.629b).