SANTA CRUZ, California -- In an incident tinged with irony, a suspected DUI driver's vehicle overturned after he slammed into a roadside sign in California that read "REPORT DRUNK DRIVERS, CALL 911."The crash, which occurred on Highway 1, left the man injured. Police said the motorist might not have survived had he not been wearing his seatbelt.No other injuries were reported.Investigators described the man as being "quite intoxicated" at the time of the collision.