Big I (I-40/I-25) reconstruction & ITS infrastructure.
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Big I (I-40/I-25) reconstruction & ITS infrastructure.

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English

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  • Abstract:
    The New Mexico Department of Transportation (NMDOT) rebuilt the Big I interchange

    in Albuquerque to make it safer and more efficient and to provide better access. The Big

    I is where the Coronado Interstate (I-40) and the Pan American Freeway (I-25) intersect

    in Albuquerque, New Mexico. The original Big I was designed to support an average

    daily traffic (ADT) of 40,000 vehicles and was severely over capacity, experiencing an

    average of 1.7 crashes per day that were estimated to cost about $12 million annually

    (data from 1999). ADT in the interchange was approximately 300,000 vehicles prior to

    its redesign; the redesigned Big I has a design capacity of 400,000 ADT. The two-year

    project began on June 30, 2000 and involved 111 lane-miles of construction and 45 new

    and 10 rehabilitated bridges.

    For the Big I project, NMDOT

    employed ITS in the form of a mobile

    traffic monitoring and management

    system to help move the large number

    of vehicles through the extensive

    construction area. Mobile traffic

    monitoring and management systems

    use electronics and communications

    equipment to monitor traffic flow and

    provide delay and routing information to

    drivers and agency personnel. The ITS application deployed at the Big I in 2000 was

    used for the duration of the work zone (two years). The ITS components were deployed

    just prior to construction, with plans to incorporate portions of the system as part of a

    permanent ITS application for freeway management once construction was completed.

    NMDOT used ITS for this major construction project for several reasons, including:

    changes in traffic patterns, nighttime closures, and pre-determined alternate routes

    required that travelers be provided with high quality real-time information on travel route

    availability. The high volume of traffic moving through the Big I created great potential

    for congestion. NMDOT estimated that normal traffic volume had to be reduced by at

    least 20 percent to keep traffic moving through the Big I area. Incidents would create

    further congestion and require rapid response to avoid additional delays. A system was

    needed to provide accurate information, support quick identification of incidents, and

    help manage traffic through the area.

    The main goals of the ITS portion of the Big-I reconstruction were:

    · To provide traffic management capabilities and traffic information on traffic

    routing, detours, and significant incidents;

    · To minimize capacity restrictions due to incidents by more quickly identifying

    incidents and determining an appropriate and effective response to clear the

    roadway; and

    4

    · To enhance traffic safety.

    The total cost of the Big I ITS infrastructure project was $1.5 million. NMDOT assumed

    ownership of all the ITS components at the end of the construction project.

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