Congestion mitigation
1. Congestion mitigation for smoother activities in urban and local areas
Increasing traffic capacity and promoting public transit use to reduce societal and economical losses resulting from serious traffic congestion that occurs in both urban and local areas.
2. Comparison of ring road development among countries
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 |
3. Effect of newly developed ring road in Tokyo
Congestion was mitigated after the opening of the Central Circular Route in Dec. 2007
4. New traffic measuring techniques following development/increase of ITS
5.Example of congestion mitigation using ITS
Analyzing the cause of traffic congestion from ITS data and compare it to the traffic management policy (National highway 8, in Joetsu, Niigata)
