Left-Turn Accommodations at Unsignalized Intersections (2013) / Chapter Skim
Currently Skimming:
Pages 5-11
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 5... ...
5 Introduction Before installing a left-turn lane (or any other roadway improvement) , it is necessary to consider the characteristics of the location where it would be installed.
|
From page 6... ...
6number of lanes on the major roadway, so the warrants for rural highways also vary by number of lanes. Volume The peak-hour left-turn volume and major road volume are needed for use in the left-turn warrants.
|
From page 7... ...
7 compares it to the amount of time it would take the same vehicles to travel through the intersection under free-flow conditions. A discussion of delay and gap acceptance studies for two-way and all-way stop-controlled intersections, as well as the recommended procedure and equations to use, can be found in the Highway Capacity Manual (3)
|
From page 8... ...
8of the steps a designer could take to determine whether a leftturn lane is appropriate for a particular location. Where there are no applicable access management guidelines, adequate spacing and design consistency are both essential requirements to consider.
|
From page 9... ...
9 Table 2. Recommended left-turn lane warrants for rural four-lane highways.
|
From page 10... ...
10 • Crash modification factors available in the AASHTO Highway Safety Manual (4) , and • Construction costs.
|
From page 11... ...
11 reductions due to the installation of a left-turn lane, crash frequency or crash predictions, crash reduction factors, crash costs, and/or construction costs. If crash and/or delay data are available for a specific location, the benefit-cost method as described in the research report can be used to evaluate the potential benefit of installing a left-turn lane at a specific location.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.