Abstract
Procedures for capacity analysis of two-way stop controlled (TWSC) appeared in scientific literature in the 1970s. In addition to standard TWSC intersections, there are also non-standard unsignalised intersections. The main characteristic of these intersections is that two major approaches are not placed opposite, but next to each other. Because of the non-standard layout of the major and minor approaches, there are unique major and minor movements at these intersections. For these movements, standard procedures for capacity analysis of standard TWSC intersections cannot be used. This paper describes a procedure for capacity analysis of non-standard unsignalised intersections with a new model for rank distribution for all major and minor movements, as well as the conflict flow calculation, and the procedure for the calculation of potential and movement capacity, according to the non-standard layout of the major and minor approaches.
Highlights
Unsignalised intersections with a STOP or YIELD sign at minor approaches, or using general traffic rules, are called Two-Way Stop Controlled intersections
Capacity analysis procedure shown in this paper is related to symmetric 4-leg NSUI, where the major and a minor roads cross at 90 degrees
Non-standard two-way stop controlled (TWSC) intersections are a very common type of intersection in countries with an inherited street network. These intersections are often an optimal solution where left/right turns are intensive, because they have a priority road which bends at the centre of the intersection. These intersections had not been a point of interest for researchers, and they had not been analysed in the field of capacity analysis
Summary
Unsignalised intersections with a STOP or YIELD sign at minor approaches, or using general traffic rules, are called Two-Way Stop Controlled intersections (or TWSC). These intersections are very common in street and road networks in all states in the world, whereby 3-leg or 4-leg intersections with standard layout of approaches are most prevalent. The Harders’ equation for capacity calculation proposed for standard TWSC in the HCM2010 [6] can be used for NSUI This claim is based on the fact that every standard TWSC intersection can become non-standard by changing the position of a STOP or YIELD sign, or vice versa.
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