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The interchange is comprised of four freeway segments (i.e. there are four freeway 'paths' of travel into the complex). Note that the actual number of numbered highways intersecting at this interchange is two - these freeways are: A unique characteristic of this interchange is the 'splitting' of the transition, or connector, roads into two sections. Between each section both freeways 'share' road alignments for a distance of about 2 miles. The 'shared' alignment is 8 lanes in width in each direction. However, ''through traffic'' (i.e. traffic on one freeway that is not transitioning to the other) is not isolated from ''transition traffic'' by a concrete barrier, median, or similarly appropriate partition, which results in unpredictable weaving, abrupt slowing, and last-minute merging. Congestion is exacerbated by the fact that it is also one of the busiest Freeway sections in Southern California with an average daily traffic of over 300,000 cars. An addition contributor to this interchange's complexity is the lack of complete freedom of movement. Southbound traffic on the Orange Freeway (CA/SR-57) does not have a direct connection to the eastbound Pomona Freeway. Conversely, westbound traffic on the Pomona Freeway does not have a direct connection to the northbound Orange Freeway. In both cases, vehicles must exit the freeway and use a surface street in order to complete the transition. Traffic congestion is heaviest on the shared alignment of the southbound Orange Freeway and westbound Pomona Freeway during the morning, peak rush hour. A major contributing factor is the commuter traffic from the suburban, 'bedroom' communities of the Inland Empire to job and activity centers in Los Angeles County and Orange County . In the afternoon, the condition is reversed as these commuters return home. The congestion at this interchange is readily apparent as it affects traffic flow on the eastbound Pomona Freeway from as far away to the west as its interchange with the San Gabriel River Freeway (Interstate 605) . Northbound traffic on the Orange Freeway is similarly affected as far south as the Orange Crush interchange complex. As of October 2005, the California Department of Transportation (Cal-Trans) is currently reconstructing this interchange and building additional carpool lanes to increase the efficiency of vehicle movement. |
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