TRAFFIC STUDIES AT AN ENTRANCE RAMP TERMINAL ON A TWO-LANE FREEWAY

TRAFIKSTUDIER VID RAMANSLUTNING TILL MOTORTRAFIKLED

This study deals with the effects on traffic of a change of design of an entrance ramp terminal in an interchange on a two-lane freeway. In the first case the entering traffic was controlled by a stop sign. In the second case the stop sign was removed and the entrance terminal was provided with an acceleration lane. Without the acceleration lane more than 50% of the merging vehicles used the shoulder for acceleration. With the acceleration lane about 15% of the merging vehicles tended to force their way into the through traffic lane at the end of the acceleration lane. The other vehicles continued on the shoulder if the through traffic lane was occupied, or decreased their speed on the acceleration lane. The provision of an acceleration lane resulted in a decreased number of overtaking manoeuvres. The time taken for vehicles in the interchange to merge also decreased, for passenger cars by 15-25 sec and for trucks by 20-30 sec, depending on the traffic flow. /TRRL/

• Corporate Authors:

  Royal Institute of Technology, Sweden

  Road Building Institute, Fack S-10044
  Stockholm 70,   Sweden 
• Authors:
  • Ackerberg, B
  • Buren, H
• Publication Date: 1974

Language

• Swedish

Media Info

• Features: Figures; References; Tables;
• Pagination: 43 p.

Subject/Index Terms

• TRT Terms: Acceleration lanes; Access roads; Freeways; Interchanges; Mechanical acceleration; Merging traffic; Passing; Road shoulders; Safety; Time; Traffic flow; Traffic lanes; Traffic signs; Traffic surveys; Two lane highways
• Uncontrolled Terms: Modifications; Traffic studies
• Old TRIS Terms: Entering vehicles; Lay-out
• ITRD Terms: 5405: Acceleration; 435: Access road; 433: Interchange; 2885: Layout; 647: Merging traffic; 9048: Modification; 2752: Motorway; 1822: Overtaking; 1665: Safety; 5414: Time; 671: Traffic flow; 2827: Traffic lane; 553: Traffic sign
• Subject Areas: Design; Highways; Operations and Traffic Management; Planning and Forecasting; Safety and Human Factors; I21: Planning of Transport Infrastructure; I73: Traffic Control;

Filing Info

• Accession Number: 00098127
• Record Type: Publication
• Source Agency: Swedish National Road and Traffic Research Institute
• Report/Paper Numbers: R&D Rept.
• Files: ITRD, TRIS
• Created Date: Nov 5 1975 12:00AM