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South Dakota Department of Transportation
Project Synopsis
SD1994-14


Title: Crash Testing of Dual Cedar Posts
Project Researcher: Dan Johnston, SDDOT
Project Manager: Jon Becker
Research Period: -
Status:
Cost: $0.00

Problem Statement:The SDDOT has previously drilled 4" X 6" Cedar posts for breakaway applications because of results from crash testing of 4" X 6" Southern Pine posts. After having successfully crash tested single undrilled 4" x 6" cedar posts (SD93-04), it is desired that additional crash testing be done to gain approval for dual undrilled posts (2 posts within a 7 ft width).

Findings:
Title: Crash Testing of Dual Cedar Posts
Project Researcher: Dan Johnston, DOT
Project Manager: Jon Becker
Research Period: -
Status:
Cost: $0.00

Problem Statement:The SDDOT has previously drilled 4" X 6" Cedar posts for breakaway applications because of results from crash testing of 4" X 6" Southern Pine posts. After having successfully crash tested single undrilled 4" x 6" cedar posts (SD93-04), it is desired that additional crash testing be done to gain approval for dual undrilled posts (2 posts within a 7 ft width).

Findings:

Research Objectives:
1  To determine whether dual undrilled 4" X 6" cedar posts may be used in breakaway applications.

Research Tasks:
1  Perform crash test with an 1800lb (820 kg) vehicle travelling at 20mph (35 kph) impacting a dual 4" X 6" western red cedar sign post embedded in weak soil. (see attached configuration). Test procedures shall be in accordance with NCHRP Report 350, a
2  If test in task one fails, contact research panel for further direction to rerun 20mph (35kph) test in standard soil. If test passes, go to task three.
3  Perform crash test at 60mph (100 kph) in standard soil, using the above parameters. Whether this test passes or fails, go to task 4.
4  Prepare and submit final report and executive summary including test methods, data, findings, analysis, recommendations and any other pertinent information necessary to approve or reject design.

Documents Available:
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