On March 1, 1985, the plaintiff, Ronald Eppinga, filed a complaint against Jim Edgar, the Secretary of State, in the circuit court of Cook County seeking restoration of his driving privileges and a declaration that the provision of the Illinois Vehicle Code (Code) (Ill. Rev. Stat. 1983, ch. 95 1/2, par. 1-100 et seq.) under which his license was revoked was unconstitutional. On March 22, 1985, the court granted summary judgment in favor of the Secretary of State (Secretary), and we granted the plaintiff's motion for direct appeal under our Rule 302(b) (94 Ill.2d R. 302(b)). On January 9, 1985, the plaintiff was involved in an automobile collision in Proviso Township. The police officer who came upon the scene determined that the plaintiff was traveling southbound in a northbound lane of a four-lane divided highway and struck a northbound vehicle head-on. The reporting officer and a companion officer detected a strong odor of alcohol on the plaintiff's breath and observed that his face was flushed and that his eyes were bloodshot. His speech was described as confused and incoherent. The plaintiff first said that he did not know where he was and admitted to having had four or five drinks of scotch. He was arrested and charged with the offense of driving under the influence of alcohol (Ill. Rev. Stat. 1981, ch. 95 1/2, par. 11-501(2)). The driver and the passenger of the other vehicle were severely injured. The driver sustained a broken left knee, sprained left ankle, ruptured left lung, and multiple contusions on her face. The passenger's left arm was fractured in two places, requiring surgery. She also suffered a swelling of the facial area, a loss of short-term memory, and blurred vision. Weeks after the accident she continued to experience loss of memory and double vision.