CEDAR RAPIDS — Four rulings expected from the Iowa Supreme Court in the coming months could have a sweeping impact on how automated traffic cameras are used in Iowa — if they are allowed at all.The cases, two of which the state’s high court will receive next week, explore the constitutionality of the cameras through several different lenses, such as whether cities or the state has jurisdiction over the automated cameras on primary highways and interstates; motorists’ due process; and equal protection for motorists versus government vehicles and semi-trailer truck drivers, who in effect are exempt from the tickets.