Prebbleton Scheme Assessment

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GHD has completed a review of five intersections adjacent to the Prebbleton, a township in the Selwyn District in the Canterbury Region of New Zealand, located 11 km southwest of the centre of Christchurch.

The objective of this project was to propose suitable upgrades to improve safety, reduce severance through the township, and provide more efficient linkages to the motorway interchange currently under construction.

Traffic volumes have increased significantly along arterial roads adjacent to the township in the past five years, mainly due to effects of the earthquake in Christchurch and the resulting migration of people. Moreover, construction has begun recently on a new motorway extension (CSM2) nearby, which will change current traffic patterns significantly in the area.

This project entailed the analysis of five intersections, located on different arterial roads, in low and high-speed environments, with changes expected to existing traffic patterns, not just as a result of general growth.

GHD was faced with the challenge of using the limited data available to model future designs for the intersections. In response, our team proposed to use existing CAST model data and undertake additional data validation to ensure it was suitable for modelling purposes. The combination of our local knowledge, modelling experience and appreciation of traffic generation patterns allowed us to determine robust turning volumes for a future year scenario.

Added value on the project came through the SATURN and SIDRA modelling skills available in the GHD team, combined with undertaking appropriate sensitivity tests. This approach brings the benefit of the proposed intersection designs being based on robust data and being future proofed. This limits the risk of future construction and consenting work along the corridor in the future, and the associated inconvenience that this would cause to the community.

Throughout the project and ongoing works, GHD has collaborated with Selwyn District Council to meet project objectives as well as to keep them fully informed of progress and issues as they surfaced.

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