I checked with the MSP on this one. The No Turn On Red sign has been taken down and the reason they are turning on the solid red arrows are "Red arrow and yellow arrow indications have the same meaning as the corresponding circular indications, except that they apply only to vehicle operators intending to make the movement indicated by the arrow. It makes no difference if the “steady” red signal is a ball or an arrow. The prohibitive sign, signal, etc., would have to state "No Turn on Red" The trooper gave the link for the law...http://legislature.mi.gov/doc.aspx?mcl-257-612