California Blvd & 1st St. / 2nd St.

Napa, CA

OVERVIEW

MTJ Roundabout Engineering provided roundabout capacity analysis, horizontal design optimization, signing and pavement marking recommendations, and visualizations for this project, as a member of the consulting team led by Omni-Means.

MTJ’s Review/Design Optimization Process includes:

1. Traffic Planning, Operational Analysis, Context Evaluation
2. Alternative Concept Development
3. Preliminary & Final Horizontal Design

SUMMARY

• This design optimization process resulted in a context-appropriate series of 3 roundabout designs that minimized impacts and maximized benefits while adhering to roadway and roundabout-specific safety design principles.
• This unique application includes differing lane assignments necessary for each entry and addresses system-wide lane continuity.
• Safety and accessibility objectives were achieved via geometrics that promote slow vehicular speeds and safety for all modes.
• The designs provided a unique, innovative solution that accommodated multi-modal objectives to achieve Complete Streets goals.

HIGHLIGHTS

• Pedestrian and bicycle connectivity safety
• Gateway to historic downtown Napa
• Business access and circulation
• ICDs: 144′ x 120′, 147′, 120′

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