Guidelines for marking multi-lane roundabouts

Print version: Guidelines for marking multi-lane roundabouts (PDF, 343 KB, 19 pages)

2.   Guidelines

• 2.1   Analysis
• 2.2   Typical examples of multi-lane roundabouts
• 2.3   Design guides
• 2.4   Vulnerable road users

2.1   Analysis

These guidelines are modelled on best practice both in New Zealand and in Australia. Multi-lane roundabouts in both urban and rural areas were examined. This included seven 4-leg, two 5-leg and two 3-leg multi-lane roundabouts, each with varying entry/exit lane configurations providing a range of ‘Alberta’ treatments. These treatments were (where appropriate) compared with Australian best practice using references in research carried out by Grant Thomas of the University of Canterbury whose project report, ‘Rural Roundabouts and their Application in New Zealand’, was presented at the 2003 Traffic Management Workshop and Technical Conference in Christchurch.

2.2   Typical examples of multi-lane roundabouts

Twelve figures depicting typical layouts for approach markings and exit lanes for multi-lane roundabouts have been included in these guidelines. Figure 4.1, depicting a single lane roundabout, has been included to illustrate the recommended layout of pavement markings and traffic signs needed to provide guidance for motorists approaching and negotiating a roundabout. Figure 4.2 and Figure 4.3 have been included to illustrate the recommended approach pavement markings for multi-lane roundabout splitter islands.

2.3   Design guides

The guideline examples are to be read in conjunction with the Manual of Traffic Signs and Markings (MOTSAM) and are not intended as a replacement for Austroads and other design guides for the construction of roundabouts. The treatments depicted in Figure 4.1 to Figure 4.12 reflect best practice and provide a basis for designing pavement markings for specific roundabouts.

2.4   Vulnerable road users

Designers are encouraged to seek expert advice for the design of roundabouts for cyclists. Austroads Guide to Traffic Engineering Practice Part 14: Bicycles and the Transit New Zealand supplement to that document provide guidance for the design of cycle facilities in New Zealand. Due to the complexities of design no attempt has been made to include specific cycle or pedestrian facility guidance for the treatments depicted in Figures 4.1 to 4.12 in this document.

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Page created: 28 November 2008