The Ridgefield Board of Selectmen has approved vendor permits for mobile food operations.  Bridge Street Premium Ice Company will sell sorbet from a tricycle-cart for the first time.  The other permits were renewals for the Chez Lenard hot dog stand on Main Street and the Zwack Shack lunch truck operated off Route 7.  Bridge Street plans to primarily operate at special events and private parties.  The  vending trike is street legal in Connecticut, but the owner will be hauling it to events on a trailer.  The permit specifies that it not be operated on town roads or sidewalks.