The U.S. government and a group of leading global automakers are set to announce a ground-breaking voluntary agreement at the Detroit auto show on Friday aimed at dramatically improving the industry's safety, according to company officials. The unprecedented accord could set the framework for further discussions on safety reforms and mark a new era of cooperation between automakers and regulators after a record-setting year of safety fines, recalls and investigations into malfunctioning vehicles made by General Motors Co, Fiat Chrysler Automobiles NV, Honda Motor Co and others.