PASSENGER CAR UTILIZATION OF AVAILABLE INTERSECTION SPACE WHEN TURNING INTO A MAIN ROAD

PERSONBILARS UTNYTTJANDE AV KORSNINGSUTRYMME VID PAAFART TILL PRIMAERVAEG

The type of intersection studied was the simple unsignalized right-angle crossing between a primary and a secondary road, either entirely without traffic islands or with one island in the secondary road exit. The studies were performed at four intersections and comprised right and left turning movements of passenger cars from the secondary road. Only the vehicle paths were observed and there were no measurements of time or speed. A video-camera mounted on a tower was used for the observations, and a coordinate system was set out with paint markings on the road surface. The following results were obtained. On passing from the secondary to the primary road by a left turn the vehicle paths were nearly coincident before passing the stop or yield line. There was then a marked spread between different paths in the area lacking guidance elements. A certain number of cars always used parts of the opposite lane on left turning, thus creating an additional conflict area and introducing a hazard. This points out the need for better guidance. If there were shoulders on the primary road, many drivers used them as acceleration lanes after a left or right turn. /TRRL/

• Corporate Authors:

  Royal Institute of Technology, Sweden

  Road Building Institute, Fack S-10044
  Stockholm 70,   Sweden 
• Authors:
  • Jorborg, N
  • Nilsen, J
• Publication Date: 1977

Language

• Swedish

Media Info

• Features: Figures; References;
• Pagination: 47 p.

Subject/Index Terms

• TRT Terms: Arterial highways; Automobiles; Behavior; Drivers; Intersections; Photography; Primary highways; Secondary roads; Traffic islands; Traffic lanes; Traffic surveys; Turning traffic; Unsignalized intersections; Vehicle dynamics
• Uncontrolled Terms: Turning movements; Vehicle path
• ITRD Terms: 9001: Behaviour; 1772: Driver; 455: Junction; 2748: Main road; 6751: Photography; 2773: Secondary road; 2827: Traffic lane; 676: Traffic survey; 1836: Turning
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; Safety and Human Factors; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00164270
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Thesis
• Files: ITRD, TRIS
• Created Date: Jan 30 1978 12:00AM