Roundabouts: An Informational Guide – Second Edition (2010) / Chapter Skim
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Pages 315-330
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Chapter 10/Construction and Maintenance Page 10-1 Roundabouts: An Informational Guide CHAPTER 10 CONSTRUCTION AND MAINTENANCE CONTENTS 10.1 INTRODUCTION .
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Roundabouts: An Informational Guide Page 10-2 Chapter 10/Construction and Maintenance LIST OF EXHIBITS Exhibit 10-1 Example of Roundabout Informational Brochure .
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Chapter 10/Construction and Maintenance Page 10-3 Roundabouts: An Informational Guide 10.1 INTRODUCTION This chapter focuses on issues related to the actual construction of a roundabout as well as issues related to ongoing maintenance. 10.2 PUBLIC EDUCATION One of the most important aspects of planning a roundabout construction project is providing public education.
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Roundabouts: An Informational Guide Page 10-4 Chapter 10/Construction and Maintenance As part of the new roundabout installation in Clackamas County, a public information meeting was also held. Exhibit 10-2 provides two of the presentation boards that were used at the meeting to illustrate the proposed roundabout plan and expected project schedule.
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From page 319... ...
Chapter 10/Construction and Maintenance Page 10-5 Roundabouts: An Informational Guide Anecdotal experience suggests that minimizing detour changes during construction is desirable to reduce public confusion through the time of construction. It is easier to communicate one or two different detours to the driving public through the course of a project versus constantly changing routes.
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Roundabouts: An Informational Guide Page 10-6 Chapter 10/Construction and Maintenance Exhibit 10-3 Example of Construction under Partial Traffic Baldwin Road/Coats Road/Indianwood Road A single-lane roundabout was constructed at the intersection under partial traffic using four construction stages. Baldwin Road is the major roadway, which includes the west and south approaches of the intersection.
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Chapter 10/Construction and Maintenance Page 10-7 Roundabouts: An Informational Guide Exhibit 10-3 (cont.) Example of Construction under Partial TrafficStage III: West Approach Construction Complete roundabout improvements on west approach.
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Roundabouts: An Informational Guide Page 10-8 Chapter 10/Construction and Maintenance 10.3.3 CONSTRUCTION UNDER FULL TRAFFIC If it is not possible to detour all approaches, detour as many approaches as possible. This reduces the volume of traffic through the intersection and the number of turning movements available.
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Chapter 10/Construction and Maintenance Page 10-9 Roundabouts: An Informational Guide Prior to the work that would change the traffic patterns to that of a roundabout, certain peripheral items may be completed. This would include permanent signing (covered)
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Roundabouts: An Informational Guide Page 10-10 Chapter 10/Construction and Maintenance Phasing should (to the extent possible) be aimed to train drivers in correct driving rules and habits once fully opened.
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Chapter 10/Construction and Maintenance Page 10-11 Roundabouts: An Informational Guide ment markings cannot be placed, channelizing devices (i.e., cones, tubular markers, and/or drums) should be used to establish the travel path.
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Roundabouts: An Informational Guide Page 10-12 Chapter 10/Construction and Maintenance that design details are properly executed and respond to contractor questions. The design and construction team should also coordinate closely with utilities to ensure that the existing equipment can be preserved, as needed, and new equipment can be integrated into the system.
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Chapter 10/Construction and Maintenance Page 10-13 Roundabouts: An Informational Guide for safe access by maintenance crews and only minimal disruption to traffic at the roundabout. 10.7 MAINTENANCE Maintenance of roundabouts is similar to that of any other intersection.
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Roundabouts: An Informational Guide Page 10-14 Chapter 10/Construction and Maintenance One common method for snow removal is for the snowplow to start on the innermost section of the circulatory roadway, often on the truck apron, and keep circulating while spiraling outward with each revolution clearing the snow from the circulatory roadway. At the same time, a second plow operator will clear the entries and exits, or the same plow operator will clear the approaches once the circulatory roadway is clear.
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Chapter 10/Construction and Maintenance Page 10-15 Roundabouts: An Informational Guide 10.7.3 PAVEMENT MAINTENANCE AND REHABILITATION Pavement maintenance and rehabilitation projects are similar to new construction as far as construction staging. It is preferred that maintenance be conducted under as little traffic as possible; however, it can be done under traffic using the techniques described earlier in this chapter.
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From page 330... ...
Roundabouts: An Informational Guide Page 10-16 Chapter 10/Construction and Maintenance 10.8 REFERENCES 1. Orchard Hiltz & McCliment, Inc., and Hampton Engineering Associates, Inc.
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