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| Author | : Pius O. Igharo |
| Publisher | : |
| Total Pages | : 66 |
| Release | : 2004 |
| Genre | : Roads |
| ISBN | : |
| Author | : Paul Abbott (Of the Washington State Department of Transportation) |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2022 |
| Genre | : Roads |
| ISBN | : |
A pilot routine in-service performance evaluation (ISPE) was undertaken for guardrail terminals following the process outlined in NCHRP 22-33. Controlled stop, rollover, vehicle mix, and secondary impacts on the roadside and roadway were evaluated as performance measures using data sourced from the Crash Location & Analysis System (CLAS) database and the WSDOT Engineering Crash Data Mart for years 2016 through 2020. Four Performance Assessment Levels, ranging from no exclusions of crash data to exclusions of crash data limited to vehicle type and speed limit were assessed. For all five performance measures, the study found no measurable differences between the performance of the major types of guardrail terminal in use on state highways within WSDOT jurisdiction.
| Author | : Malcolm H. Ray |
| Publisher | : Transportation Research Board |
| Total Pages | : 75 |
| Release | : 2003 |
| Genre | : Nature |
| ISBN | : 0309087627 |
"This is a report on a research agenda to better inform future societal decisions on ocean CDR [carbon dioxide removal]; the Committee is not advocating either for or against possible future ocean CDR deployments, and the Committee recognizes that ocean CDR would, at best, complement the role of climate mitigation approaches including decarbonization"--Page viii.
| Author | : Paul Abbott (Of the Washington State Department of Transportation) |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2022 |
| Genre | : Roads |
| ISBN | : |
A pilot routine in-service performance evaluation (ISPE) was undertaken for cable barrier following the process outlined in NCHRP 22-33. Barrier breach, rollover, vehicle mix, and secondary impacts on the roadside and roadway were evaluated as performance measures using data sourced from the Crash Location & Analysis System (CLAS) database and the WSDOT Engineering Crash Data Mart for years 2016 through 2020. Four Performance Assessment Levels, ranging from no exclusions of crash data to exclusions of crash data limited to vehicle type and speed limit were assessed. For all five performance measures, the study found no measurable difference between the performance of the four major types of cable barrier in use on state highways within WSDOT jurisdiction, including three-strand versus fourstrand.
| Author | : National Research Council (U.S.). Transportation Research Board |
| Publisher | : |
| Total Pages | : 130 |
| Release | : 2000 |
| Genre | : Bridge railings |
| ISBN | : |
Transportation Research Record contains the following papers: Evaluation of portable concrete barriers using finite element simulation (Marzougi, D, Bahouth, G, Eskandarian, A, Meczkowski and Taylor, H); Impact performance of the G4(1W) and G4(2W) guardrail systems : comparison under NCHRP report 350 test 3-11 conditions (Plaxico, CA, Ray, MH and Hiranmayee, K); Long-span guardrail system for culvert applications (Faller, RK, Sicking, DL, Polivka, KA, Rohde, JR and Bielenberg, BW); Transitions from guardrail to bridge rail that meet safety performance requirements (Buth, CE, Menges, WL, and Bligh, RP); Performance of breakaway cable and modified eccentric loader terminals in Iowa and North Carolina : in-service evaluation (Ray, MH and Hopp, JA); Safety effectiveness of upgrading guardrail terminals to NCHRP reports 350 standards (Ray, MH); Design and development of steel breakaway posts (Sicking, DL, Rohde, JR and Reid, JD); Evaluating human risk in side impact collisions with roadside objects (Ray, MH and Hiranmayee, K); In-service, performance-based roadside design policy : preliminary insights from Washington State's bridge rail study (Shankar, VN, Albin, RB, Milton, JC and Nebergall, M); Test level 4 bridge rails (Buth, CE, Menges, WL and Williams, WF); Estimation of time of concentration for Maryland streams (Thomas, WO, Monde, MC and Davis, SR); Temporal variations in heavy metal partitioning and loading in urban highway pavement sheet flow : implications for in situ treatment design (Sansalone, JJ and Glenn, DW); California Department of Transportation statewide storm water management program (Johnston, J, Yamaguchi, H and Frankel, A).
| Author | : National Academies of Sciences, Engineering, and Medicine (U.S.). Committee for Study of In-Service Performance of W-Beam Guardrail End Treatments, Phase 1 |
| Publisher | : |
| Total Pages | : |
| Release | : 2017 |
| Genre | : Roads |
| ISBN | : 9780309460200 |
"TRB Special Report 323, In-Service Performance Evaluation of Guardrail End Treatments, develops a research design for evaluating the in-service performance of guardrail end treatments and other roadside safety devices and identifies the data required to do so. Given the substantial data requirements and methodological challenges of conducting successful evaluations of particular end treatments, the committee concludes that state highway agencies will require more information about the benefits, costs, and practicality of routine in-service evaluation of end treatments in general before deciding to undertake new data collection and analysis programs necessary to carry out more challenging analyses. The committee recommends research to advance practice and test the feasibility of and costs associated with more complex evaluations. It also recommends research to examine whether procedures for testing the performance of devices should be altered"--Provided by publisher.
| Author | : Wanda L. Menges |
| Publisher | : |
| Total Pages | : 73 |
| Release | : 2019 |
| Genre | : Highway research |
| ISBN | : |
States with extreme winter weather are faced with difficulty in maintaining and repairing W-beam guardrail and end terminal posts installed in soil. Due to frozen soil conditions, posts installed directly in soil require more resources and equipment to repair and can delay repair of a damaged guardrail and/or end terminal. In addition, longer duration needed for repair increases the exposure of maintenance workers to oncoming traffic. Some states currently install the steel posts in steel tubes as an alternative to posts installed directly into soil to facilitate repair. This project evaluates the performance of the W-beam guardrail and end terminals with steel posts installed in buried steel sleeves. The researchers performed surrogate bogie vehicle impact tests on posts installed directly in soil and compared their performance to posts installed in buried steel sleeves. On finding similar force-deflection response, the researchers performed a full-scale crash test with posts installed in sleeves. Test 3-35 of American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH) was performed with the non-proprietary Downstream Anchor Terminal (DAT) anchoring each end of the test installation. The 31-inch W-beam guardrail with DAT and steel posts installed in steel sleeves performed acceptably for MASH Test 3-35. Results of the test show that W-beam guardrail steel posts installed in buried steel tubes perform similar to the direct embedded posts in guardrail’s end terminal region and the length of need.
| Author | : American Association of State Highway and Transportation Officials. Task Force for Roadside Safety |
| Publisher | : |
| Total Pages | : 560 |
| Release | : 1989 |
| Genre | : Roads |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 256 |
| Release | : 2005 |
| Genre | : Roads |
| ISBN | : |
Current methodologies for the in-service performance evaluation (ISPE) of roadside safety features are not viable and practical for all state departments of transportation. The research team developed an ISPE process that is sensitive to the data and resource constraints of Texas Department of Transportation (TxDOT). The following methodology was used to develop The TxDOT-ISPE process: identify the objectives of the ISPE, estimate expected extent of data collection, evaluate existing DOT procedures and organizational structure, identify features to be included in the ISPE, develop framework for an ideal ISPE, identify system constraints within the DOT, identify alternative methodologies and data sources for the ISPE, design DOT-specific ISPE process, design and conduct a pilot test of the ISPE, evaluate the data collection methodology and data quality during the pilot test, and recommend an ISPE process for TxDOT.
| Author | : Jarvis Dale Michie |
| Publisher | : |
| Total Pages | : 432 |
| Release | : 1971 |
| Genre | : Transportation |
| ISBN | : |
Barrier installations are warranted (or justified) only at highway locations where the consequence of an errant vehicle leaving the roadway is judged to be more hazardous than the impact with the barrier installation. A six degree-of-freedom mathematical model was found to be useful in describing dynamic behavior of a vehicle during impact. Predictions of vehicle and barrier behavior correlated with results obtained from full-scale crash tests. Crash conditions simulated with a computer were used to identify and evaluate vehicle static and dynamic as well as barrier parameters. Vehicle weight, yaw mass moment of inertia, and deformation constant were found to be significant.
