South Segment (SR-163 to SR-56): Unit 1 is a 4.5-mile segment of lanes stretching from Miramar to Escondido, where Flatiron is widening I-15 to accommodate managed lanes. Flatiron installed moveable barriers along a 1.5-mile stretch of managed lanes and used 13 different types of retaining walls at Unit 5, which ran from Via Rancho Parkway to Center City Parkway. This project included eight post-tensioned box girder bridges, 9,000 cubic meters of retaining wall concrete, 32,000 cubic meters of PCC pavement, and 251,000 cubic meters of roadway excavation.įlatiron constructed 1.5 miles of I-15 lanes from Poway Road to Carmel Mountain Road to complete Unit 4. Unit 3 consists of a 2.5-mile stretch of managed lane construction and a bridge reconstruction over Lake Hodges. Middle Segment (SR-56 to Centre City Parkway): At Unit 2, Flatiron constructed 20 retaining walls, five new bridges and five direct access ramps. The project includes the widening of nine bridges, five earth retaining walls, five masonry block sound walls, storm drain and water system improvements, 110,000 cubic meters of exported material and 22,600 cubic meters of concrete pavement. North Segment (Centre City Parkway to SR-78): Flatiron upgraded a 2.6-mile portion of Interstate 15 at Unit 1 to contain four new HOV lanes. Flatiron was responsible for units 2-5 in the Middle Segment, Units 1 and 3 in the South Segment and Unit 1 in the North Segment. Highway authorities manage lanes by using a moveable median barrier to change the number of lanes in each direction, depending on traffic flow.Ĭonstruction along the I-15 corridor was divided into three segments, which were further divided into units. Managed lanes were constructed within the existing median, providing direct “rapid” access by allowing buses to enter and exit the highway via dedicated on and off ramps. The project is an adaptable, high-tech transportation facility designed to meet the diverse needs of local travelers, commuters and commerce in the San Diego region. Flatiron executed this work under eight contracts totaling approximately $420 million. The Interstate 15 Managed Lanes project is a new 20-mile section of High Occupancy Toll (HOT) lanes stretching from State Route 163 north to State Route 78 along Interstate 15 in San Diego, Calif.
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