§ Project · 2023 · Wellington — Johnsonville

Johnsonville Safety Improvements — Business Case + Design

Business case, options development, traffic engineering, signal design and post-construction monitoring for Johnsonville safety improvements — including cycle lanes, bus priority, and dual-lane signal intersection.

73
Crashes in 10 years (2012–2022)
31
Crashes in 5 years
18 → 2
Options long-list to short-list
Johnsonville Safety Improvements — Business Case + Design

Overview

Wellington City Council engaged TTAP for the Johnsonville Safety Improvements project, addressing congestion, turning safety, speeding, zebra-crossing compliance and pedestrian / cyclist conflict in central Johnsonville. The brief covered business case through to post- construction monitoring.

What we did

  • Business case with options development, MCA, and engagement workshops
  • Traffic engineering and traffic-signal design — dual-lane signal intersection treatment
  • Civil design for short-list options including bus priority lane, southern and northern cycle lanes, cycle priority box, and improved Frank Johnson entrance
  • Modelling of the preferred option’s performance against demand forecasts
  • Communications and engagement with community and stakeholders
  • Post-construction monitoring to verify the safety case as built
Annotated aerial of the Johnsonville–Moorefield roundabout area in Wellington showing existing road geometry, project intervention zones, surrounding tree-cover and engineering markup.
The Johnsonville–Moorefield intersection — one of the high-risk locations addressed by the safety-improvement programme.

Outcome

The preferred option balanced safety improvement, mode shift, project alignment, emission reduction and community needs. The post- construction monitoring closed the loop on the business-case promises and gave WCC a defensible record of intervention effectiveness.

Team

Bob Hu (Managing Director / Principal Traffic Engineer) led the business-case workstream. Simon Cager (Principal Project Engineer) chaired traffic engineering and civil design. Stu Zhang (Transport Modeller / Assets Analyst) built the AIMSUN modelling that underpinned option evaluation. Charles Agate (Senior Assets Engineer / Traffic Management Specialist) led the traffic-signal design and post- construction monitoring. Ana Wang (Senior Project Manager) coordinated the workshop engagement and community-stakeholder strand.

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