Intersections without Traffic Signals II: Proceedings of an International Workshop, 18–19 July, 1991 in Bochum, Germany

In March 1988, an international workshop on intersections without traffic signals was held at the Ruhr-University in Bochum, Germany. The proceedings of this workshop were published by Springer 1). The workshop was performed in a very harmonious atmosphere, which stimulated the experts from different countries to communicate and exchange their ideas and experiences. The presentations and the written contributions documented the present state of technical solutions for design and engineering of unsi­ gnalized intersections both regarding scientific research and practical applications. Moreover, numerous unsolved problems were identified. Thus, the 1988 workshop stimulated new developments in the field of unsignalized inter­ sections in several countries. In the meantime, these investigations have lead to a remarkable progress. For example in Germany a new guideline for unsignalized cross intersections and T-junctions has been finished and is going to be introduced in 1991. New results on roundabout capacity have been worked out as well. Many particularly important developments were made in foreign countries. Especially in the United States, an increasing interest in this subject can be observed. In the annual meetings of the TRB, this item received great attention. Many research institutes in North America have concentrated their activities on that point. A new TRB-circular concerning unsignalized intersections is going to be published. It will contain a new procedure for four-way-stop-control intersections, which seems to be a special feature of North American traffic engineering. However, new results from the US for two-way-stop­ control intersections are available as well.

Table of Contents:
Capacity and Safety of Roundabouts in Germany.- Polish Guidelines for Capacity Analysis of Priority Intersections.- Aspects of the Calculation of Unsignalized Intersections.- Roundabouts in Switzerland - Recent Experiences, Capacity, Swiss Roundabout Guide.- Experiences with Intersections without Traffic Signals in Great Britain.- Calculation Procedures for German Practice: Intersections without Traffic Signals.- Modular System for Traffic Simulation at Intersections and in Networks.- A Comparative Study of Roundabout Capacity Procedures.- Roundabouts and Road Safety.- Evolution of Design Rules for Urban Roundabouts in France.- Case Study. Performance Effects of Changing a Traffic Signal Intersection to Roundabout.- A Microscopic Simulation Model of Roundabout Entry Operations.- A General Capacity Formula for Unsignalized Intersections.- Intersections without Traffic Signals - Swedish Experiences on Capacity and Safety.- A Strategy to Optimise the Geometric Design of Isolated Priority Junctions.- Hungarian Measuring Results: Observations and Methods for Calculating Capacity at Intersections without Traffic Signals.- Unsignalized Intersections and Roundabouts in Australia: Recent Developments.- Gap Acceptance and Risk Analysis at Unsignalized Intersections.- Use, Design and Safety of Small Roundabouts in Norway.- Accident Prediction Models for Unsignalized and Signalized Intersections.- Gap Acceptance, Wait Time, and Risk Aversion at Unsignalized Intersections.- Simulation of Multilane Stop-Controlled T-Intersections by KNOSIMO in Canada.- Estimating High and Low Flow Rates at Unsignalized Intersections.- Empirical Models for Estimating Capacity and Delay at Stop-Controlled Intersections.