highway in Mexico was compliant. When the corridor was first approved, two bottlenecks were identified with the Arizona portion of the corridor that required significant infrastructure to address. The first was the route of U.S. Route 93 across northwestern Arizona, which then included a slow route with numerous hairpin curves over the Hoover Dam. The Hoover Dam Bypass opened on October 16, 2010, resolving that issue. The second issue was a gap near Phoenix. The official designation is Interstate 10 to U.S. Route 93 at Phoenix. However, US 93 does not enter Phoenix or connect with I-10. US 93 currently terminates at Wickenburg, northwest of Phoenix. To make the connection originally required driving U.S. Route 60, a surface street through the western suburbs of Phoenix that was not compliant with the standards established by the treaty. The chosen alternative for resolution involved creating a compliant connection between Wickenburg and Phoenix via upgrades and extensions to Arizona State Route 303. Most of the upgrades have been completed, with the final phase expected to be complete by the end of 2016. A second proposal has since been made for a freeway connection between Las Vegas, Nevada, and Casa Grande, Arizona, Interstate 11, that would in its course connect Wickenburg to Phoenix. Railroad NAFTA also established the CANAMEX corridor for rail usage. While most of the corridor is paralleled by existing rail lines, there is no existing contiguous line that follows the entire corridor, and through rail traffic from Canada to Mexico would have to use alternate corridors for at least parts of the journey. The Union Pacific Railroad owns and operates a rail line following the corridor between Nogales, Sonora, Mexico, and Phoenix, Arizona, acquired from the former Southern Pacific Railroad. There is no railroad directly connecting and Phoenix and Las Vegas, Nevada, but it is possible to route trains between those cities via Barstow, California along tracks owned by Arizona and California Railway and/or BNSF Railway. The Union Pacific again owns tracks following the I-15 portion of the corridor from Las Vegas, to Butte, Montana, acquired from the former Los Angeles and Salt Lake Railroad and Oregon Short Line. No line directly follows the corridor between Butte and Helena, Montana, but it is possible to route trains between those cities via a combination of BNSF Railway and Montana Rail Link lines. North of Helena, BNSF owns lines that closely follow the