* '''Inner Ring Road''' (The City Ring "MO"): Once completed it will surround the wider central part of the city. The longest city tunnel in Europe with a length of  and five interchanges has been completed to relieve congestion in the north-western part of Prague. Called ''Blanka tunnel complex'' and part of the City Ring Road, it was estimated to eventually cost – after several increases – CZK 43 billion. Construction started in 2007 and, after repeated delays, the tunnel was officially opened in September 2015. This tunnel complex completes a major part of the inner ring road.