BROOK HILL ROUNDABOUT, SHEFFIELD: A BEFORE-AND-AFTER STUDY

Observations were made of traffic delays before and after the 35 m diameter small-island layout was introduced. The "before" study covered the period prior to any alternation of the original roundabout layout, whilst the "after" study was carried out 8 months after completion of the new roundabout traffic capacity experiment. The pattern of traffic movements through the intersection during both morning and afternoon peak hours and typical off-peak periods were recorded, as well as traffic delay during these periods. The results confirm that the increased capacity shown in observations has led to a reduction in delays to vehicles despite increases of 8 to 10 percent in the peak hour traffic volumes. Peak hour delays are estimated to have been reduced by some 3500 veh-hr per annum.

• Supplemental Notes:
  • Presented at Seminar X (Road Design 1: General Topics) of the PTRC Summer Annual Meeting, Warwick University, England, 8-12 July 1974.
• Corporate Authors:

  Planning and Transport Res and Computation Co Ltd

  167 Oxford Street
  London W1R 1AH,   England 
• Authors:
  • Ashworth, R
• Publication Date: 1974-7

Media Info

• Features: Figures; References;
• Pagination: p. 172-182
• Serial:
  • Publication of: Comision Permanente del Asfalto
  • Publisher: Comision Permanente del Asfalto

Subject/Index Terms

• TRT Terms: Before and after studies; Highway capacity; Highway design; Peak hour traffic; Traffic circles; Traffic control; Traffic delays
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00096286
• Record Type: Publication
• Report/Paper Numbers: PTRC/P/108
• Files: TRIS
• Created Date: Sep 10 1975 12:00AM