U-POST INVESTIGATION, FINAL REPORT.

The New Jersey Department of Transportation has conducted twenty-six full scale crash tests on steel and aluminum U-posts. Thirteen of the tests involved steel U-posts and thirteen involved aluminum U-posts. The sign installations contained from one to four posts for both the steel and aluminum tests. The tests were conducted on the four pound per foot steel sections and the four and eight pound per foot equivalent aluminum sections with both 2,000 pound and 4,500 pound vehicles; the impact speed ranged from 20 to 45 mph, and the impact angle ranged from 0 deg. (head-on) to 20 deg. in accordance with Federal Highway Administration test conditions. Results of our dynamic testing indicate that simultaneously impacting more than one 4 pound per foot steel U-post, or more than three aluminum U-posts produces conditions which do not satisfy present Federal Highway Administration criteria (1968 tentative criteria). The testing has also indicated that the use of aluminum bolts for the signpost connection yields less severe speed changes than the stainless steel bolts, when only a partial number or posts are impacted by the vehicle. /Author/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 61 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00260801
  • Record Type: Publication
  • Source Agency: National Safety Council Safety Research Info Serv
  • Report/Paper Numbers: #74-003-7758
  • Files: TRIS, STATEDOT
  • Created Date: Oct 22 1974 12:00AM