Avenue and between Colfax and 6th Avenue by December 1997. A new interchange at Alameda Avenue was completed and opened in 2002 and a new flyover ramp at Parker Road began in September 2000 to complete the interchange between Parker Road and I-225. Another interchange at 17th Place was added and opened on February 15, 2013. The portion from I-25 to SH 83/Parker Road was rebuilt as part of the T-REX Project completed in 2006. The highway was later widened between Parker Road and Mississippi Avenue to six lanes, as part of a project to widen the entire freeway to I-70; construction on this portion took place between May 2012 and November 2014. The RTD R Line, a light rail line, follows the entire length of I-225 from I-25 to near I-70. Its tracks run parallel to the freeway and also use its median and is interlined with a portion of the RTD H Line. The light rail project was approved in 2004 as part of the FasTracks program, began construction in 2012, and was completed in February 2017. Exit list See also References External links Colorado Routes 200-233 25-2 25-2 Transportation in Denver Transportation in Arapahoe County, Colorado Transportation in Adams County, Colorado Transportation in Aurora, Colorado 225