Railroad Pass
With the pending construction of the Boulder City Bypass introducing the I-11 designation to Nevada, the Nevada Department of Transportation (NDOT) sought to connect the new route to other interstate highways. NDOT submitted an application to AASHTO at their spring 2014 meeting to request the designation of "Future Interstate 11", which included routing I-11 along existing I-515 between Railroad Pass and the I-215 Henderson Spaghetti Bowl interchange—AASHTO approved this request on May 29, 2014, with condition that it also be approved by the Federal Highway Administration. The Boulder City Bypass was completed in August 2018. As a result, I-515 was shortened by to its current length of . NDOT began replacing I-515 signs along the southern stretch with I-11 signs on March 17, 2019. The signing continued through April 26, 2019.