The state Department of Transportation has announced that it plans to implement a so-called "road diet" on a two-mile stretch of Elmwood Avenue, in Cranston and Warwick, starting Monday, April 15.Currently, the stretch allows for two lanes of traffic in each direction. It will be changed to one lane in each direction, with a center lane for left-hand turns.A DOT traffic analysis found that the changes would not cause delays on this stretch of Elmwood Avenue.