Congestion was mitigated after the opening of the Central Circular Route in Dec. 2007
Completion rate of Tokyo’s ring roads is 48%. Ring roads in the main cities in other countries are well developed with multiple lanes.
City Planned | length | Length in service | Completion rate | note |
Tokyo | 525km | 251km | 48% | as of Apr. 2012 |
Beijing | 433km | 433km | 100% | Completed on Sep. 12, 2009 |
Seoul | 168km | 168km | 100% | Completed on Dec. 28, 2007 |
Paris | 313km | 272km | 87% | as of Jan. 2011 |
Washington D.C. | 103km | 103km | 100% | Completed in 1998 |
London | 188km | 188km | 100% | Completed in 1986 |
Berlin | 223km | 217km | 97% | as of Jan. 2009 |