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FHWA Home / Safety / Geometric Design / Publications / Mitigation Strategies For Design Exceptions

Site Constraints

The historic structures and historic context of the highway are a major constraint in terms of meeting current design criteria.  Caltrans concluded that the impacts to these historic elements would not be acceptable.  In addition, a channelized river, the Arroyo Seco, parallels SR 110 on the east, constraining the available cross-sectional width on that side (Figure 117).  Development adjacent to the highway and the interchanges further constrains major geometric improvements in some locations.  

Figure 117.  The Arroyo Seco Channel runs adjacent to the Parkway, constraining its width on one side.

FIGURE 117

The Arroyo Seco Channel runs adjacent to the Parkway, constraining its width on one side.

Figure 117 is a photo showing the Arroyo Seco Channel adjacent to the Parkway.  At this location, vehicles can enter/exit the Parkway via a bridge over the Channel, which contains a small stream of water.
 
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Page last modified on April 1, 2019
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