The city has an extensive avenue network with numerous main arteries up to ten lanes wide and Zagreb bypass, a congested four-lane highway encircling most of the city. Finding a parking space is supposed to be made somewhat easier by the construction of new underground multi-story parking lots (Importanne Center, Importanne Gallery, Lang Square, Tuškanac, Kvaternik Square, Klaić Street, etc.). The busiest roads are the main east–west arteries, former Highway "Brotherhood and Unity", consisting of Ljubljanska Avenue, Zagrebačka Avenue and Slavonska Avenue; and the Vukovarska Avenue, the closest bypass of the city center. The avenues were supposed to alleviate the traffic problem, but most of them are nowadays gridlocked during rush hour and others, like Branimirova Avenue and Dubrovnik Avenue which are gridlocked for the whole day. European routes E59, E65 and E70 serve Zagreb.