It’s a concrete jungle out there. Just ask Jimmy Retzos, owner of Columbus Bakery, 502 Pearl St., who has been forced to take his act on the road. Traffic snarls caused by the recently shuttered on-ramp at I-81’s Pearl Street entrance means backed-up cars down Pearl and North Salina Street, especially during the afternoon rush hour as downtown workers scram out of the city, so faithful Columbus customers are unable to drive by to snag one of Retzos’ loaves of bread for dinnertime consumption. So now Retzos is outside his shop hawking his wares to commuters stuck in the jam. “Get the best Italian bread in town!” he exhorts to drivers, as he gives them the bargain price of $2, instead of the usual $2.25. “I’m taking a loss but it’s better than throwing them out at the end of the day,” Retzos reasons. Retzos says the road woes won’t be over until mid-October, so loyal loafers may want to avoid the hassles by parking a block away on North State Street near Ilario’s Tratorria and walking down to grab a flat, point or sandwich specialty.