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Pages 300-314

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From page 300...
... Chapter 9/Landscaping Page 9-1 Roundabouts: An Informational Guide CHAPTER 9 LANDSCAPING CONTENTS 9.1 INTRODUCTION .
From page 301...
... Roundabouts: An Informational Guide Page 9-2 Chapter 9/Landscaping LIST OF EXHIBITS Exhibit 9-1 Examples of Landscaping .
From page 302...
... Chapter 9/Landscaping Page 9-3 Roundabouts: An Informational Guide 9.1 INTRODUCTION Landscaping is one of the distinguishing features that give roundabouts an aesthetic advantage over traditional intersections. Landscaping in the central island, splitter islands (where appropriate)
From page 303...
... Roundabouts: An Informational Guide Page 9-4 Chapter 9/Landscaping (b) Davis, California (c)
From page 304...
... Chapter 9/Landscaping Page 9-5 Roundabouts: An Informational Guide (e) Coralville, Iowa (f)
From page 305...
... Roundabouts: An Informational Guide Page 9-6 Chapter 9/Landscaping (h) Towson, Maryland (i)
From page 306...
... Chapter 9/Landscaping Page 9-7 Roundabouts: An Informational Guide 9.2 PRINCIPLES Landscaping should be designed to ensure that vehicles can observe the signing and shape of the roundabout as they approach and have adequate visibility for making decisions within the roundabout. As described in Chapter 6, the sight distance requirements at the roundabout dictate the size and types of landscaping materials appropriate for the various areas within and adjacent to the roundabout.
From page 307...
... Roundabouts: An Informational Guide Page 9-8 Chapter 9/Landscaping 9.3 CENTRAL ISLAND LANDSCAPING The landscaping of the central island can enhance the safety of the intersection by making the intersection a focal point, by promoting lower speeds, and by breaking the headlight glare of oncoming vehicles. Landscaping elements should be selected so that sight distance (discussed in Chapter 6)
From page 308...
... Chapter 9/Landscaping Page 9-9 Roundabouts: An Informational Guide perimeter area of the central island. If used, fixed objects should preferably be placed in a location where the geometry of the roundabout deflects approaching vehicles away from the object.
From page 309...
... Roundabouts: An Informational Guide Page 9-10 Chapter 9/Landscaping In northern climates, the salt tolerance of any plant material should be considered, as well as snow storage and removal practices. In addition, landscaping that requires watering may increase the likelihood of wet and potentially slippery pavement.
From page 310...
... Exhibit 9-6 (cont.) Examples of Central Island Art Chapter 9/Landscaping Page 9-11 Roundabouts: An Informational Guide (b)
From page 311...
... Roundabouts: An Informational Guide Page 9-12 Chapter 9/Landscaping Exhibit 9-7 Landscaping Trade-Offs Example: Landscaping Trade-Offs Scenario A roundabout has been designed on a state highway on the eastern edge of a city. The east approach has a posted speed of 50 mph, and all other approaches have a posted speed of 35 mph.
From page 312...
... Chapter 9/Landscaping Page 9-13 Roundabouts: An Informational Guide 9.4 SPLITTER ISLAND AND APPROACH LANDSCAPING When designing landscaping for the splitter islands and along the outside edges of the approach, care should be taken with the landscaping to avoid obstructing sight distance since the splitter islands are usually located within the critical sight triangles (see Chapter 6)
From page 313...
... Exhibit 9-9 Maintenance of Landscaping in Central Island Roundabouts: An Informational Guide Page 9-14 Chapter 9/Landscaping and expected growth of the plantings should be addressed. Exhibit 9-9(a)
From page 314...
... Chapter 9/Landscaping Page 9-15 Roundabouts: An Informational Guide should be located such that visibility and access for vehicles and pedestrians is preserved (5)

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