IOWA NARROW BRIDGE ACCIDENT STUDY

THE IOWA NARROW BRIDGE STUDY INCLUDED A TOTAL OF 72 BRIDGES, INCLUDING 65 BRIDGES WITH LESS THAN 24-FT HORIZONTAL CLEARANCE ON ALL ROADS WITH 24-FT SURFACE. THE ACCIDENT RECORDS FROM THE FILES OF THE TRAFFIC AND HIGHWAY PLANNING DIVISION WERE CHECKED FOR A 12 YEAR PERIOD FROM JAN. 1, 1948, TO DEC. 31, 1959. THESE ACCIDENTS WERE SEPARATED INTO TWO GROUPS. THE FIRST GROUP INCLUDED ACCIDENTS OCCURRING BEFORE, AND THE SECOND GROUP AFTER, THE ROAD SURFACE WAS WIDENED TO 24 FT. THE NUMBER OF ACCIDENTS, BRIDGES HIT, INJURIES AND PROPERTY DAMAGE WERE COMPILED FOR EACH BRIDGE, TOGETHER WITH THE NUMBER OF MONTHS THE BRIDGE WAS IN EITHER CATEGORY.

• Supplemental Notes:
  • Vol 31, No 7, P 23, 2 TAB
• Authors:
  • Gunnerson, H E
• Publication Date: 1961-7

Media Info

• Serial:
  • Highway Research Abstracts
  • Publisher: Highway Research Board (HRB)

Subject/Index Terms

• TRT Terms: Before and after studies; Crashes; Narrow bridges; Pavement widening
• Old TRIS Terms: Widening pavement
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00221565
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jun 11 1972 12:00AM