Kelly Dr. & Park Dr., Kelly Dr. & Hillside Dr.

Carlsbad, CA

OVERVIEW

Working with partner firm GHD, MTJ developed concept horizontal geometric mini-roundabout designs for the two intersections of Kelly Dr./Park Dr. and Kelly Dr./Hillside Dr. These designs were key components of the Complete Streets redesign of Kelly Drive.

SUMMARY

Our horizontal geometric designs for these intersections are predicated on traffic engineering, roundabout design principles and project objectives, to include:

  • Adherence to speed control safety criteria
  • Optimal roundabout safety for all modes
  • Large truck/bus movements design vehicle
  • Minimize adverse ROW/environmental impacts
  • Match proposed new cross sections

Two roundabouts were developed to accommodate the new Complete Streets cross sections. There is only a slight variation between them on the north leg – all other geometrics remain the same.

Roundabout Key Dimensions: Park Dr.

    • 78’ ICD, Full Mountable Central Island
    • 16’ circulating width (lip to lip)
    • 11’ entry widths (lip to lip), 14’ (face to face)

Roundabout Key Dimensions: Hillside Dr.

    • 85’ ICD, Full Mountable Central Island
    • 16’ circulating width (lip to lip)
    • 11’ entry widths (lip to lip), 14’ (face to face)

HIGHLIGHTS

  • Highly constrained urban context
  • Complete Streets/multi-modal
  • Avoids adverse ROW impacts
  • Maximizes ped/bike comfort/safety
  • Mini-roundabout applications
  • Large truck/emergency response vehicle accommodation
  • Accommodates on-street parking

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