INDUSTRY INVOLVEMENT

TRB

Transportation Research Board
The Transportation Research Board (TRB), as part of the National Academies of Sciences, Engineering, and Medicine, is a leading organization in transportation improvements and innovation. TRB facilitates the trusted, timely, impartial, and evidence-based exchange of information, research, and advice regarding all modes of transportation. Many Kimley-Horn staff begin their involvement in TRB during college and continue that participation throughout their careers. Our staff have been selected to chair committees, lead workshops, facilitate lectern sessions, present research, and publish papers in the Transportation Research Record: Journal of the Transportation Research Board (TRR). To date, we have written or contributed to more than 50 papers published in the TRR.

TRB Roundabouts

KIMLEY-HORN SPEAKERS, PRESENTERS, AND FACILITATORS

Sean Houck headshot photo

Sean Houck, P.E.

POSTER SESSION PRESENTER:

Boronda Road Roundabout Corridor ICE

May 16, 2022 | 9:15 AM – 9:45 AM PT

The Boronda Road corridor is a vital arterial along the north edge of the City of Salinas. The arterial is being improved to accommodate extensive housing and economic development growth north of the current urban area of Salinas. Original planning documents required a six-lane, divided arterial with signals. However, after conducting a corridor wide intersection control evaluation, it was found that the corridor could be reduced to 4 lanes with roundabout intersection control.

This presentation will provide an overview of the decision-making process used to evaluate the expansion of the corridor to accommodate planned growth. Specifically, we will cover the Intersection Control Evaluation process used to evaluate the cost effectiveness of implementing roundabouts instead of signals at four intersections within the project area.

In addition, the presentation will demonstrate the considerations evaluated in phasing the corridor improvements and added lanes to the roundabouts over time as demand ramps up.

Sean Houck, P.E.

SPEAKER:

CONCURRENT SESSION 1A - Roundabout Communities | Regional Roundabout Study: The Growth of Roundabouts in Monterey County

May 16, 2022 | 9:45 AM – 11:30 AM PT

The Monterey area started considering roundabouts in the early 2000’s, but it wasn’t until the Transportation Agency for Monterey County (TAMC) commissioned a Regional Roundabout Study in 2014 to study the cost effectiveness of constructing roundabouts in lieu of traditional signal systems. Based on the Intersection Control Evaluation Directive being formulated by Caltrans at the time, the Study had the following objectives:

  • Assess the benefit / cost of conceptual roundabouts and other intersection control measures to traditional signalized intersections at high priority intersections.
  • Identify cost effective improvements that may be eligible for grant funding.
  • Provide useful tools for jurisdictions to make investment decisions at the study intersections.
  • Prompt the ICE decision making process and framework to evaluate intersection control alternatives using a performance-based approach to engineering and investment decisions.

Since the completion of the Study in 2016, Monterey County has experienced a tremendous growth of roundabouts at all phases of design development and construction.

This presentation will provide an overview of the Regional Roundabout Study and how the study has acted as a catalyst for the 50+ roundabouts that are in the planning phase, under design, and/or will soon be constructed in Monterey County.

Sean Houck, P.E.

SPEAKER:

CONCURRENT SESSION 3B - Transit and Trucks | Roundabout Corridor with Transit Priority

May 16, 2022 | 3:15 PM – 4:45 PM PT

The Imjin Parkway road widening project will widen a mile long stretch of arterial roadway from 2 lanes to 4 lanes and will construct roundabouts at the four-way intersection in the project. The project is one of two corridors that connect the Monterey Coastal areas to the Salinas Valley. The corridor is also planned to be a multi-modal corridor with class 1 bike path, class 2 bike lanes, and a primary transit route.

As part of the corridor improvements currently under design, a system to preempt traffic in favor of transit is being considered. This presentation will focus on the potential use of ITS or other technology to interrupt traffic flows entering the roundabout and give priority to transit buses.

Catherine Sydnor headshot photo

Catherine Sydnor, P.E.

SPEAKER:

CONCURRENT SESSION 3C - Roundabout Support | Chief of Police and Fire Chief Roundabout Testimonials, Version 2.0

May 16, 2022 | 3:15 PM – 4:45 PM PT

Many public agencies in the U.S. are implementing roundabouts and may be somewhat new to their operational performance under emergency response conditions. Evidence exists for the reduction of fatalities and injuries when roundabouts replace other forms of intersection control, however, there is not documentation of how roundabouts may affect the safety and response time of emergency personnel.

The Audience will learn how:

  • To document U.S. first responder’s feelings towards roundabout intersections and highlight any specific issues faced by first responders.
  • To determine if there is a consensus amongst first responders whether roundabouts are beneficial to their daily operations and performance, or if roundabouts are a detriment.

The results of this research can hopefully be shared with these types of agencies to spur discussion with their local police and fire department about considerations that can be made in the planning and design process for roundabouts in their jurisdictions.

Sean Houck, P.E.

SPEAKER:

CONCURRENT SESSION 5A - Turbo Roundabouts | Buffered Roundabouts

May 17, 2022 | 10:00 AM – 11:30 AM PT

There is a growing interest in the use of turbo roundabouts in the US. What are the benefits of switching to a turbo design? Do we even need to change our current state of practice for modern roundabout design in the U.S.? If so, what problems are we trying to fix?

Over the past couple of years, the presenter has both listened to and participated in the debate. With the goal of reducing minor collisions in multilane roundabouts, we should consider adding another item to the toolbox. Why can’t we bring the best of the US-based modern roundabout design techniques together with some Dutch-based turbo roundabout design techniques?

This presentation will cover the benefits of using a buffered based design using a range of multilane roundabout design examples in various stages of project development:

  • Retrofit
  • Conventional highway
  • Heavy truck traffic (Case 3)
  • Interchange
  • Suburban arterial with challenging entry-exit geometry

Sean Houck, P.E.

SPEAKER:

CONCURRENT SESSION 9C - Roundabouts in the Ground | Bardin Road Safe Routes to School Project

May 18, 2022 | 9:45 AM – 11:00 AM PT

The Bardin Road Safe Routes to School Improvements Project in Salinas, CA is a road diet and safety enhancement project with a focus on improving vehicular, pedestrian, and bicycle access to Bardin Elementary School. In particular, two contiguous roundabouts were utilized to maintain vehicular flow while providing safe access to the school’s drop-off and pick-up zone. The original intersection of Bardin Road and Alisal Street consisted of three separate intersections closely spaced with multiple decision points, undesirable intersection angles, high vehicular speeds, and a propensity for poor driving decisions made by parents. The dual roundabouts consolidate the decision points, slow vehicle speeds, and provide an innovative way for vehicles from all directions to gain access to the school drop-off and pick-up area.

Key benefits of the dual roundabout are:

  • Safer access to the elementary school for children
  • Orderly vehicle access to the school
  • Facility connectivity for all travel modes
  • Over-all safety through speed and conflict point reduction
  • Community beautification

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