CHICAGO (WLS) — A prominent former Chicago alderman was arrested for an alcohol-related incident that damaged several cars, according to police.Authorities said the 48-year-old suspect was headed southbound on Astor Street when he hit several parked vehicles along a four-block stretch of Astor on the Near North Side.The former alderman struck a tree after hit the parked cars. The driver was taken to Northwestern Hospital in good condition and charges are pending, officials say.