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Dokken Engineering prepared the Plans, Specifications and Estimate (PS&E) for improvements to the interchange and Leucadia Boulevard. The existing interchange was a tight diamond configuration with unsignalized intersections at the ramp termini. The project reduced congestion along Leucadia Boulevard and improved safety. Local development to the east of the interchange was contingent upon completion of the interchange. An accelerated design and construction schedule was proposed by the City of Encinitas.
Accelerated Design Schedule
To accommodate an accelerated schedule, the PS&E package was completed and approved in 12 months. To meet the ambitious schedule, close coordination was required between Caltrans and Dokken design staff.
Accelerated Construction Schedule
Dokken provided effective construction design support, and the project proceeded smoothly to completion of an ambitious 12 month construction schedule. To aid in the fast-track schedule, a 1-week full ramp closure was provided for the contractor to complete the ramp improvements in the most efficient manner. |
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Interchange Improvements
A special feature of the project was the creation of a northbound hook on-ramp that improved intersection spacing. Important design issues included:
- Widening of Leucadia Boulevard and overcrossing from 2 to 6 lanes and upgrading the interchange to meet growing traffic volumes.
- Use of retaining walls while widening the ramps so that no additional right of way was required.
- Signalization of ramp intersections.
- Addition of ramp metering.
- Coordination with on-going City design of adjacent project.
- Provisions were made for future widening.
- Conversion of frontage road to one way street.
Retaining Walls
Several retaining walls were utilized to minimize right of way requirements along Leucadia Boulevard and the southbound on-ramp. |
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