Safety Performance of Part-Time Shoulder Use on Freeways, Volume 2: Conduct of Research Report (2021) / Chapter Skim
Currently Skimming:
Pages 3-14
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 3... ...
5 C H A P T E R 2 - L I T E R A T U R E R E V I E W Literature Review Introduction This chapter describes the findings from a review of the domestic and international literature related to part-time shoulder use (PTSU) and bus-on-shoulder (BOS)
|
From page 4... ...
6 Table 1. Part-time shoulder use design and operations options.
|
From page 5... ...
7 Figure 1. Components of a freeway with PTSU operation.
|
From page 6... ...
8 before-after study was conducted with data from two comparable time periods – 2013 (before implementation of PTSU operation) and 2014 (after implementation)
|
From page 7... ...
9 Virginia An operational evaluation was conducted on the I-66 PTSU facility in Virginia. The study, which was conducted in 2007, revealed that the PTSU operates at near capacity with volume-to-capacity ratios of 0.90 to 1.00 in the eastbound direction and 0.83 to 1.00 in the westbound direction.
|
From page 8... ...
10 Table 2. Safety experience with BOS projects.
|
From page 9... ...
11 issues with other types of exclusive transit facilities (e.g., motorists not observing new or changed traffic signal operations associated with new light rail and busway facilities) tend to appear immediately after the facility opens.
|
From page 10... ...
12 Median Width A CMF for freeway median width is provided in Chapter 18 of the HSM Supplement (AASHTO 2014)
|
From page 11... ...
13 A 2016 study examined the overall operational and safety effects of narrow lanes and shoulders on freeways throughout the United States (Neudorff et al.
|
From page 12... ...
14 speed and density is reached. Once this threshold is reached, the crash rate rapidly increases.
|
From page 13... ...
15 Queue Length A 2016 study focused on evaluating the safety effects of an end-of-queue warning system at freeway work zones (Ullman et al.
|
From page 14... ...
16 Table 4. Knowledge gaps for PTSU- and BOS-related conditions potentially affecting safety.
|
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.