Crews are still working around the clock to plow and salt roads and haul away massive loads of snow from Pittsburgh’s streets, Mayor Corey O’Connor said Wednesday afternoon. About a foot of snow pummeled Pittsburgh on Sunday, marking the snowiest day the city had seen in 16 years. Some of those contractors are focused not just on plowing, but also hauling away the giant snow banks that are blocking parking spots and making intersections tricky to navigate. Crews have already removed more than 10,000 tons of snow from roads, heaping the accumulation up at sites throughout the city, O’Connor said. Earlier in the week, 37 city trucks broke down during one overnight shift.