France (2000 as a friendship and cooperation agreement, renewed 2005) Pretoria, South Africa (2002, renewed 2008 and 2011) Seoul, South Korea (2006) Accra, Ghana (2006) Sunderland, United Kingdom (2006, renewed 2012) Rome, Italy (2011, renewed 2013) Ankara, Turkey (2011) Brasília, Brazil (2013) Addis Ababa, Ethiopia (2013) San Salvador, El Salvador (2018) Infrastructure Transportation Streets and highways There are of streets, parkways, and avenues in the district. Due to the freeway revolts of the 1960s, much of the proposed interstate highway system through the middle of Washington was never built. Interstate 95 (I-95), the nation's major east coast highway, therefore bends around the district to form the eastern portion of the Capital Beltway. A portion of the proposed highway funding was directed to the region's public transportation infrastructure instead. The interstate highways that continue into Washington, including I-66 and I-395, both terminate shortly after entering the city. According to a 2010 study, Washington-area commuters spent 70 hours a year in traffic delays, which tied with Chicago for having the nation's worst road congestion. However, 37% of Washington-area commuters take public transportation to work, the second-highest rate in the country. An additional 12% of D.C. commuters walked to work, 6% carpooled, and 3% traveled by bicycle in 2010. Cycling In May 2022, the city celebrated the expansion of its bike lane network to , a 60 percent increase from 2015. Of those miles, were protected bike lanes. It also boasted of bike trails. D.C. is part of the regional Capital Bikeshare program. Started in 2010, it is one of the largest bicycle sharing systems in the country with more than 4,351 bicycles and more than 395 stations, all provided by PBSC Urban Solutions. Walkability A 2011 study by Walk Score ranked Washington, D.C. was the seventh-most walkable city in the country with 80% of residents living in neighborhoods that are not car dependent. In 2013, the Washington Metropolitan Area had the eighth lowest percentage of workers who commuted by private automobile (75.7 percent), with 8percent of area workers traveling via rail transit. River crossings There are multiple transportation methods to cross the city's two rivers, the Potomac River and the Anacostia River. There are numerous bridges that take cars, trains, pedestrians, and bikers across the rivers. Among these are Arlington Memorial Bridge, the 14th Street Bridges, Francis Scott Key Bridge, Theodore Roosevelt Bridge, Woodrow Wilson Bridge, and Frederick Douglass Bridge. There are