Use of Barriers in Rural Open Road Conditions—A Synthesis Study

The use of wide medians and clear zones that do not require median and roadside barriers is the current design practice for new and reconstructed rural highway facilities. Constructing or reconstructing roads with full-width medians and clear zones is much more expensive today compared to when the design standards were developed. Considerable costs can be accrued in additional overhead bridge length, earthwork and ROW in new construction projects, and widening of existing right–of-way and bridge structures in reconstruction projects. This synthesis study focuses on the use of median barriers and roadside barriers and it identifies: (a) the current design practice and the existing body of knowledge, (b) design conditions where adding extra traffic lanes without widening the ROW is acceptable from the point of view of safety and costs if barriers and guardrails are installed, and (c) future research needs. One of the practical outcomes of the project is a set of Crash Cost Modification Factors (concept found in the German design guidelines) estimated based on the past research for Indiana and simulation experiments executed with the Roadside Safety Analysis Program. These factors can be used to evaluate the safety benefit produced by a modified cross-section of a rural freeway.

• Record URL:
  https://doi.org/10.5703/1288284314670
• 
• Summary URL:
  https://rosap.ntl.bts.gov/view/dot/25034
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/25033
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/25005
• Corporate Authors:

  Purdue University

  Joint Transportation Research Program
  West Lafayette, IN  United States  47907-2051

  Indiana Department of Transportation

  100 N Senate Avenue
  Indianapolis, IN  United States  46204

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Chen, Erdong
  • Brown, Jennifer
  • Tarko, Andrew
• Publication Date: 2012-10

Language

• English

Media Info

• Media Type: Web
• Edition: Final Report
• Features: Figures; References; Tables;
• Pagination: 63p

Subject/Index Terms

• TRT Terms: Barriers (Roads); Clear zones; Highway design; Highway safety; Median barriers; Rural highways
• Subject Areas: Design; Highways; I20: Design and Planning of Transport Infrastructure;

Filing Info

• Accession Number: 01450082
• Record Type: Publication
• Report/Paper Numbers: FHWA/IN/JTRP-2012/08
• Contract Numbers: SPR-3515
• Files: NTL, TRIS, ATRI, USDOT, STATEDOT
• Created Date: Oct 23 2012 9:15AM