stimulus project and one of the biggest construction jobs in nearly a decade. It added a 6-mile carpool lane and directly connected the carpool lanes on the San Diego Freeway (I-405) with the San Gabriel Freeway (I-605) and the Garden Grove Freeway (State Route 22). The project also improved and rebuilt three freeway overpasses at Valley View Street, Seal Beach Boulevard and the 7th Street Bridge into Long Beach. Riverside Freeway (SR-91): This project added a new eastbound lane between the SR-241 in Orange County and the SR-71 in Riverside County, widening bridges and building new retaining and sound walls to reduce traffic noise. This was the first project in a series of improvements planned for the SR-91. The second project added a new lane in each direction from the SR-55 to SR-241. The third project added a new westbound lane from SR-57 to Interstate 5. The project was completed in 2015. Orange Freeway (SR-57): Work began in the summer of 2011 on the SR-57 to add a new northbound lane from Orangethorpe Avenue to Lambert. The project was completed in early 2014. Another project, which added a new northbound lane from Katella Avenue to Lincoln Avenue, got underway in early 2012 and was completed by late 2014. I-5 Gateway Project: Construction began in spring 2006 on the I-5 Gateway project. The four-year project widened the remaining two miles of the I-5 in Orange County from the SR-91 to the Los Angeles County line. The I-5 Gateway project is the final link in the original Measure M's freeway improvement program. The project was completed in 2010. In addition to freeway improvements, OCTA is in the midst of the most comprehensive rail safety program in the nation that includes a public awareness program regarding safety near the tracks and implementing safety enhancements at more than 50 railroad crossings throughout the county. The safety enhancements scheduled for completion in 2011 include: Upgrades to warning devices in place to advise drivers of train tracks ahead Additional gate arms to prevent drivers and pedestrians from crossing the tracks when the gates are lowered and a train is passing Extended and raised medians to deter drivers from passing around lowered gates Coordinated local traffic signals to prevent vehicles from stalling on the tracks 91 Express Lanes OCTA owns and operates the 91 Express Lanes, after purchasing them in 2003 from the California Private Transportation Corporation.