New estimates to complete the loop ranged from an additional $6 million to $12 million. The eastern part of the loop was later canceled as a cost-cutting measure. The boulevard that ran on top of the subway, Central Parkway, officially opened to traffic on October 1, 1928, and was followed by a week of public celebration. However, by the late 1920s, Prohibition had severely impacted the city, because alcoholic beverages, a major source of revenue for the city, were not allowed to be purchased. Still, as late as 1926–1927, new tunnels, such as the Hopple Street Tunnel, were being built.