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Boronda Road Widening Project

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  • Mckinnon Street Round About
  • Boronda Road Widening Project - El Darado Drive Round About
  • Boronda Road Widening Project - Hemingway Drive Round About
  • Boronda Road Widening Project - Independence Boulevard Round Project
  • Boronda Road Widening Project - Natividad Road Round About

Project Location:

Between Dartmouth Way and Hemingway Drive.

Project Description:

Roundabouts (Choice 1) and signalized intersections (Choice 2) are the two choices of intersection controls that are being considered for the Boronda Road Widening Project at the following intersections: McKinnon Street, El Dorado Drive, Natividad Road, Independence Boulevard, and Hemingway Drive.

The signalized intersections (Choice 2) will have six (6) lanes of roadway (3 lanes each way), with median, bike lanes, and sidewalk/landscape parkway. The six-lane plan will be built in two Phases: Phase 1 will widen the roadway to five lanes (three lanes going east and two lanes going west) with median and bike lanes with traffic signals at all intersections; and Phase 2 will construct the sixth lane (third lane going west) and sidewalk on the north side along a landscape parkway when the north of Boronda Future Growth Area will develop.

Roundabouts (Choice 1) will have four lanes of roadway (2 lanes each way) with median, bike lanes, and sidewalk/landscape parkway. The roundabout plan will be built in two Phases: Phase 1 will widen the roadway to four lanes (two lanes each way) with the roundabouts, median, and bike lanes; and Phase 2 will construct the sidewalk on the north side with the landscape parkway when the north of Boronda Future Growth Area will develop.

Study results showed that the 2-lane roundabouts with 4-lane corridor would generally meet the future (Year 2064) traffic demands of East Boronda Road with a level of service (LOS) of B. Other studies also indicated that roundabouts have the following advantages as compared to signalized intersections: fewer traffic fatalities; fewer injury crashes; less severity of collisions; less number of person-hours delayed in traffic; less traffic-related pollutants; short pedestrian crossing distance; less operation and maintenance cost; create a calmer corridor; and has a positive effect on property values. The disadvantages are: more land area needed at the intersections; and less familiarity for drivers on how to navigate a roundabout.

The advantages for a signalized intersections are: familiarity at the intersections; and less land area needed at the intersections; while the disadvantages are: cars approach at higher speed; higher likelihood of severe collisions; long pedestrian crossing distance; signal maintenance; more traffic-related pollutants; higher noise levels at intersection; and more time delay waiting for lights.

The Roundabout concept will be presented to the City Council at its meeting on May 16, 2017 at 4:00pm.