Stage 3 Evaluation of the four arterial route options

Summary

The purpose of the Stage 3 report is to evaluate the four best arterial route options against various criteria and modelling scenarios and present this data to the public. The report

  • summarises the traffic modelling results
  • discusses the economic evaluation and funding assessment
  • details the consultation undertaken after the Stage 2 report
  • provides an assessment of each of the four proposed arterial route options against criteria including: economics, noise, social impact, air quality, water quality and aquatic ecology, heritage, cultural (iwi)

Below is a summary of some of the assessment outcomes for each of the options. All costs are estimates. Please note that letters assigned to the options refer to the original long list in the Stage 2 report, which is why they appear out of order. Intermediary options were those that were ruled out.

Full details including explanations of findings can be found in the Stage 3 report and its attachments. Download the report and its appendices.

Talk it over

Members of the Decision Making Team will be available to the public to discuss the contents of the Stage 3 report both at public drop in sessions:

  • Elma Turner Public Library (activities room off the Childrens Library) – Monday 14 February 2011 12 – 1pm
  • Council Chamber, Nelson City Council – Tuesday 15 February 2011, 5 – 6pm
Discuss it online

You can also choose to discuss issues and get feedback from the Decision Making Team online in the ATS Forums.

Option A - Part Time Clearways

This option proposes to install part time (initially peak-hour) clearways on Rocks Road and Waimea Road. Northbound traffic in the AM peak will use the Rocks Road clearway and southbound traffic in the PM peak will use the Waimea Road clearway. Outside the clearway periods the lanes would be available for parking.This option also includes provision for a 4m wide shared path along the waterfront.

A map of Nelson highlighting Option A.

Cost

$28.8M

Impact on property

Property purchase may be required at the sports fields at the northern end of Waimea Road.

Traffic modelling for 2036

Negligible change in traffic volumes during peak hour clearways; traffic would not be attracted to SH6 clearway in AM peak hour and would transfer to the clearway on Waimea Road /Rutherford Street in PM peak hour.

Levels of Service (LOS)

Little change in AM peak LOS, but significant improvement in PM peak compared to the base.  Modelling shows that the rationalisation of the intersections doesn’t result in additional side road capacity issues caused by increase turning movements.

Economic Evaluation
Overall Economic impact

Some localised economic costs.

Evaluation for funding and benefit cost ratio (BCR)

Dollar value for travel time savings = -$8.67M. Dollar value for vehicle operating cost savings = -$3.51M

Benefit cost ratio (BCR) = <0

Social Impact

Note; severance is defined as the road causing a disconnection of the community from local services.

Effects on Tahunanui / Rocks Road community

Increased severance, reduction of on-road parking at peaks, more difficult access to properties on Rocks Road and local businesses, opportunity to improve access from side streets and properties, improved safety for pedestrians and cyclists.

Effects on Waimea Road / Rutherford St community

Increased severance and reduced safety for pedestrians, increased delay at intersections for motorists, reduced on-road parking at peaks, increased roadside parking in off-peaks, improved access from side streets and roadside properties if more traffic lights installed.

Effects on Washington Valley/Victory community

Increase in property values – currently suppressed by threat of Southern Arterial, and less community stress with decision made.

Air quality

Human exposure level Moderate -Although this option produces higher road associated PM10 contributions than the other options the existing background contributions are low to moderate and the dispersion characteristics good.

Heritage

Negative effects on historic structures.

Cultural

Ngāti Kuia = First preference. Ngāti Toa Rangatira = Comfortable. Tiakina te Taiao represents Ngāti Koata, Ngāti Rārua, Ngāti Tama, Te Ātiawa. They wish to provide a cultural impact assessment on the recommendation after Stage 4 Report is publicly released.

Noise

Minor changes in noise and vibrations; least affected.

Option B - Southern Arterial

This option proposes to construct a new two lane road connecting St Vincent Street to Whakatu Drive. This option is similar to the Southern Corridor Local Arterial Road presented as Option 2 in the North Nelson to Brightwater study. It is a lower standard that the Southern Link in that it provides one lane in each direction with relatively narrow shoulders and at-grade rather than grade separated intersections.

A map of Nelson highlighting Option B.

Cost

$32.1M

Impact on property

Some land purchase would be required at the southern end and possibly at intersections.

Traffic modelling for 2036

Reduces traffic volumes on existing arterial routes. 20-35% reduction in trips on SH6 route, depending on the time of day, and 30-40% reduction in trips on the Waimea Road/ Rutherford Street corridor.

Levels of Service (LOS)

Significant improvements in both the AM and PM peaks on the existing arterial routes as traffic spread over three corridors.

Economic Evaluation
Overall Economic impact

Some economic benefits.

Evaluation for funding and benefit cost ratio (BCR)

Dollar value for travel time savings = $33.33M. Dollar value for vehicle operating cost savings = $4.57M

Benefit cost ratio (BCR) = 1.3

Social Impact

Note; severance is defined as the road causing a disconnection of the community from local services.

Effects on Tahunanui / Rocks Road community

Potential future opportunity to enhance cultural, social and recreational attributes of waterfront, and small reduction in traffic on SH6 but could increase speeds.

Effects on Waimea Road / Rutherford St community

Reduction in traffic levels on Waimea Road and Rutherford Street but could increase speeds.

Effects on Washington Valley/Victory community

Reduction in amenity value for cyclists and pedestrians on Railway Reserve, increased danger for pedestrians and cyclists in St Vincent Street, increased severance for residents, schools, shops and community facilities.

Air quality

Human exposure level Moderate - High. While modelling indicates a moderate reduction in PM10 concentrations for Rocks Rd and Waimea Rd the existing background contributions are high and the dispersion characteristics poor.

Heritage

Effects on historic heritage are minor.

Cultural

Ngāti Kuia = Second preference. Ngāti Toa Rangatira = Comfortable. Tiakina te Taiao represents Ngāti Koata, Ngāti Rārua, Ngāti Tama, Te Ātiawa. They wish to provide a cultural impact assessment on the recommendation after Stage 4 Report is publicly released.

Noise

Significantly increases noise and vibration for houses, businesses and schools.

Option H - State Highway 6 Four Laning

This option involves constructing a new seawall to the northwest of the existing frontage on Rocks Road and providing a dual carriageway with cycle lanes on both sides of the road.

A map of Nelson highlighting Option H.

Cost

$99.2M

Impact on property

Major property impacts with upwards of 80 properties likely affected and a large number of buildings demolished.

Traffic modelling for 2036

Negligible change in traffic volumes. Additional traffic signalised intersections may introduce delay for traffic on arterial route.

Levels of Service (LOS)

No capacity issues on the SH but little improvement on Waimea Rd corridor compared to the base as modelling shows vehicles not attracted from this route.

Economic Evaluation
Overall Economic impact

Some localised economic costs.

Evaluation for funding and benefit cost ratio (BCR)

Dollar value for travel time savings = - $14.34M. Dollar value for vehicle operating cost savings = -$0.91M

Benefit cost ratio (BCR) = <0

Social Impact

Note; severance is defined as the road causing a disconnection of the community from local services.

Effects on Tahunanui / Rocks Road community

Significant property purchase – residential and commercial, significant reduction in amenity for remaining home owners – proximity to traffic, loss of vegetation  - lower property values, increased physical and social severance, possible increase in traffic effects on SH6.

Effects on Waimea Road / Rutherford St community

Reduction in traffic levels on Waimea Road and Rutherford Street but could increase speeds.

Effects on Washington Valley/Victory community

Increase in property values – currently suppressed by threat of Southern Arterial, and less community stress with decision made.

Air quality

Human exposure level Moderate. Modelling of the four laning options indicates lower road associated PM10 contributions than the other options, with this route having low to moderate existing background contributions and good dispersion characteristics.

Heritage

Very significant effects on historic heritage.

Cultural

Ngāti Kuia = Significant impact on historical sites and structures (could be minimised with Option A). Ngāti Toa Rangatira = Opposed. Tiakina te Taiao represents Ngāti Koata, Ngāti Rārua, Ngāti Tama, Te Ātiawa. They wish to provide a cultural impact assessment on the recommendation after Stage 4 Report is publicly released.

Noise

Increases noise and vibration effects for a number of residential and commercial properties.

Option I - Waimea Rd/Rutherford St Four Laning

This option involves four laning Waima Road and Rutherford Street.

A map of Nelson highlighting Option I.

Cost

$55.4M

Impact on property

Major property impacts with upwards of 150 properties likely affected and a large number of buildings demolished.

Traffic modelling for 2036

Does not provide large alterations in traffic volumes. Some transfer of trips in peak hour and peak direction onto widened corridor.

Levels of Service (LOS)

Few locations with capacity constraints but no significant improvements in terms of travel times as there is a greater number of intersections.

Economic Evaluation
Overall Economic impact

Significant economic costs.

Evaluation for funding and benefit cost ratio (BCR)

Dollar value for travel time savings =  $10.56M. Dollar value for vehicle operating cost savings = -$3.08M

Benefit cost ratio (BCR) = 0.2

Social Impact

Note; severance is defined as the road causing a disconnection of the community from local services.

Effects on Tahunanui / Rocks Road community

Possible reduction in traffic on SH6, potential future opportunity to enhance cultural, social and recreational attributes of waterfront.

Effects on Waimea Road / Rutherford St community

Loss of residential amenity for remaining homes, road closer to schools and Nelson College; removal of vegetative buffer, swimming pool and playing courts at Nelson Girls College, property purchase – homes, commercial and retail premises, community services and facilities, loss of small retail outlets, and faster traffic speeds could increase severance.

Effects on Washington Valley/Victory community

Increase in property values – currently suppressed by threat of Southern Arterial, and less community stress with decision made.

Air quality

Human exposure level Moderate- High. Modelling of the four laning options indicates lower road associated PM10 contributions than the other options, with this route having moderate existing background contributions and moderate dispersion characteristics.

Heritage

Very significant effects on historic heritage.

Cultural

Ngāti Kuia = Possible reduction in traffic on SH6. Potential future opportunity to enhance cultural, social and recreational attributes of waterfront. Ngāti Toa Rangatira = May be acceptable if road is retained within existing road formation; probably not acceptable if more land required. Tiakina te Taiao represents Ngāti Koata, Ngāti Rārua, Ngāti Tama, Te Ātiawa. They wish to provide a cultural impact assessment on the recommendation after Stage 4 Report is publicly released.

Noise

Increases noise and vibration effects for a number of residential and commercial properties. 

Downloads

The Stage 3 Report including appendices is very large in size, so it has been split into parts for faster downloading.

Stage 3 Report (439KB PDF)

Appendix A: Option Drawings

Appendix B: Cost Estimates (120KB PDF)

Appendix C: Traffic Modelling (847KB PDF)

Appendix D: Economic Evaluation (75KB PDF)

Appendix E: Workshop Presentations (1.9MB PDF)

Appendix F: Economic Impact Assessment (95KB PDF)

Appendix G: Noise Impact Assessment (2.5MB PDF)

Appendix H: Social Impact Assessment (1.7MB PDF)

Appendix I: Air Quality Assessment (131KB PDF)

Appendix J: Water Quality Assessment (80KB PDF)

Appendix K: Heritage Assessment (159KB PDF)

Appendix L: Summary of Relevant Policy (4.3MB PDF)

Appendix M: Sea level rise on Rocks Road (66KB PDF)

Funding profile

None of the options would currently justify funding from the National Land Transport Fund so Council would have to meet the full cost.

Next Steps

In the Stage Four report – expected in a couple of months - the consultants will be recommending a preferred option for Council and the community to consider. This option will be determined once all the data collected and presented in the Stage Three report has been analysed. This analysis is a multi criteria analysis and gives more importance, or weight, to particular issues.  The importance of each issue was decided through the series of workshops held with the decision making team and this formed part of the Stage 1B report published in June 2010. Eight criteria have been decided on and each has been given a weighting score of up to 10 (10 being most important).

Health impact assessment

The Nelson Marlborough District Health Board (NMDHB) has undertaken an independent Health Impact Assessment (HIA) on the four options shortlisted in Stage 2 of the Arterial Traffic Study and, because Public Transport (PT) and Travel Demand Management (TDM), is included in each of the options, provision of this has also been assessed.  The NMDHB will be undertaking a further HIA on the preferred option identified in Stage 4.

The health impacts were assessed using the following determinants: community severance, safety, economic impact, noise, physical activity, access to health services and air quality. A simplified summary of the HIA findings is provided in the table below. Download the report. (383KB PDF) Download the report appendices. (1.6MB PDF)

Nelson Marlborough District Health Board Health Impact Assessment

Option

Health Impacts

Extent of Impact

Health Inequalities

Mitigation or Enhancement

A: Part time Clearways

Negative

Low

Neutral impact

Most impacts can be mitigated

B: Southern Arterial

Negative

Moderate

Increases inequalities

Not all impacts can be mitigated

H: Tahunanui Drive/Rocks Road Four Lanes

Negative

Major / Moderate

Neutral impact

Not all impacts can be mitigated

I: Waimea Road/ Rutherford Street Four Lanes

Negative

Major / Moderate

Neutral impact

Not all impacts can be mitigated

Public Transport/ Travel Demand Management

Positive

n/a

Reduces inequalities

Could be enhanced by further investment in active transport

From the Chief Executive

Our roading puzzle is the paramount decision facing Nelson City Council in 2011. It’s a decision that hasn’t been made to date because it is an incredibly complex one to make. Yet everyone involved wants the best outcome for Nelson and the region.  The Arterial Traffic Study is our very best shot at making a good decision. It is a research-based, comprehensive and collaborative look at our roading and transport situation now and in the future.

I’m pleased to table the Stage 3 Report in our four-stage study. Stage 3 is not about making decisions or announcing preferred options; we are simply sharing all the information we have gathered to date. This paper is an important building block on the way to making a decision and I encourage you to read as much of it as you can so we can all make the best decision when the time comes. The full report is on our website and available from Council offices and libraries - it is important that the process is transparent and we keep everyone in the loop at every step along the way.  

If you have questions or concerns or ideas to share, please take time to visit a drop in session at Council or participate in the Stage 3 forum on the Council website. At both, you can chat with members of the project team about the findings and learn where to from here. We welcome your feedback.

Keith Marshall

From the Mayor

It’s great to see the progress being made with the Arterial Traffic Study - the Stage Three report is now available for all us all to have a read. It’s worth noting that the study is being done in a collaborative way with the community. The Nelson public has been consulted on Nelson’s transport issues a number of times in recent years, through the Nelson to Brightwater Corridor Study and in the development of the Regional Land Transport Strategy and the Regional Land Transport Programme. The project team reviewed all responses to these previous consultations. Second, the ATS Decision Making Team and its consultants held two full day workshops with representatives from 33 local groups. Full documentation from these two workshops is presented in the Stage 3 report.

As you consider the four options please remember that each one also includes a public transport option and travel demand management – details about that were included in the Stage Two report. The next step on the journey is to analyse the data and see which option emerges as the best choice for our region.

I urge you to keep fully informed and be ready to do your bit in helping Council make the right transport decision for our City when the time comes.

Mayor Aldo Miccio