US101 NB Exit Ramp at Willow Road Photosimulations CalTrans, San Luis Obispo County, California POITRA Visual provided photo-realistic simulations for the California Department of Transportation (CalTrans) US101 Willow Road Interchange design project. The proposed interchange will provide highway access for an upgraded Willow Road. The interchange will serve existing farm industries and future development in San Luis Obispo County. An interim design called for a new frontage road on the south side of US101 running east from Willow Road. The frontage road will remain as part of the final interchange configuration. Visualization simulations were needed for public and agency outreach and for inclusion in environmental documents. The Engineer elected to use a series of photosimulations.

An aerial view photosimulation of the US101 Willow Road Interchange was also produced by POITRA Visual.

1. Photosimulation of Proposed Exit Ramp: Original US101 north bound exit ramp Overpass looking toward the overpass and Willow Road.

Photosimulations 2 1 E Mouse-over images above to toggle between the existing photo and the photosimulations.

POITRA artists plotted the proposed US101 Interchange onto an Engineer provided photograph from preliminary design plans. Visible elements of the proposed interchange were add including ramp laneage, fill slopes, traffic barriers and automobiles. Existing trees were removed as needed to accomodate the new fill and interchange ramps. This work was finished using traditional digital painting techniques. POITRA modelers created the interchange overpass structure, retaining walls and ramps using 3D modeling methods. Design revisions called for wider ramp lanes and shoulders and a new ramp retaining wall. The revised design was used to modify the existing simulation. The previous bridge and roadway design experience of the POITRA Visual principals always plays a significant role in accurately interpreting and representing the Engineer's design. The final simulations were used as meeting materials for CalTrans public involvement process and in the final documents.

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