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Temporary right turn ban from Coatesville/Riverhead Highway onto SH16 – 2021

Thank you to everyone who gave feedback, our public consultation closed on Friday 14 May.

We are currently analysing the feedback which will inform our decision. We are also continuing to work on our long-term safety plans for this section of State Highway 16. 

Consultation questions and answers

  •   Why are you proposing to ban right-turns out of Coatesville/Riverhead Highway now?

    We have listened to the community and their concerns about the unsafe turning movements that make the intersection of SH16 and Coatesville/Riverhead Highway (C/R Highway) difficult. We have assessed the intersection to see if there are any interim options that we can deliver that are quick, and cost effective which don’t require consents or land acquisition.

    While we are working on the design for the permanent improvements, we propose to temporarily ban right-turns out of C/R Highway onto SH16.

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  •   How much time does this add to my journey?

    If you are travelling from Riverhead, the alternative route adds approximately 100 metres to your journey.

    For people who live off C/R Highway between SH16 and Old Railway Road, the journey is no more than 3.7kms longer.

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  •   Why are you not banning all right-turn movements from SH16 and Coatesville/Riverhead Highway?

    A number of solutions were considered as part of this interim measure including banning right-turns from SH16 onto the C/R Highway.

    A right-turn ban would have a high impact on Taupaki roundabout due to the high afternoon peak volumes of people making this turn, as well as at the weekend. It would significantly decrease the efficiency of the Taupaki roundabout. A right turn into C/R can also be done safely given the existing right turn bay for motorists waiting to turn.  

    The existing bus route that Auckland Transport runs, as well as school buses, currently use this intersection to turn right onto C/R Highway. Banning right turns would negatively impact these services.

    It will also have a negative impact on the nearby retail businesses and may also lead to unsafe U-turn movements on SH16.

    We have heard from members of the community that some people already use Taupaki roundabout to turn right instead of the C/R intersection. The banning of right-turn movements out of C/R highway may encourage more people to use Taupaki roundabout for all movements in and out of this area.

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  •   Why are you not putting a left turn slip lane onto SH16 from Coatesville/Riverhead Highway?

    This project is about improving safety for all road users. A left turn slip lane was considered in the early stages of the project and ruled out as it would not address the safety issues at the intersection and the risk of high severity crashes would remain. It was also found that the conflict between vehicles turning left onto SH16 would just move further along the highway.

    It will also make it dangerous for the properties on the corner of the intersection to enter and exit their driveways.

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  •   Why can’t you ban right turns from SH16 in the morning only?

    There are a number of reasons why this is not possible. These include:

    • Impact Auckland Transport’s bus network as well as school bus routes
    • Cause confusion to the community and others travelling through the area, especially for those following online maps and not familiar with the area
    • Drivers may decide to make an unsafe U-turn into the nearest driveway or Boric carpark which increases the safety risk for everyone
    • Negative impact on traffic to set up and remove the blocked turning bay
    • Costly to have traffic management every single day which would be required to temporarily block and remove the right-turn bay
    • Negative impact on the local retail businesses close to the intersection
    • Enforcement would likely be required in the form of either a police presence or cameras. Without this people may ignore the morning ban.
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  •   Are you changing the speed limit?

    No. We are not looking to change the speed limit along this section of SH16 at this time.

    This section of highway was assessed during the speed limit review for Brigham Creek to Waimauku. It was determined that the existing 80km/h speed limit was the appropriate speed.

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  •   Why can’t you just build a roundabout now?

    Design for a roundabout is underway. A roundabout requires consents such as a resource consent as well as likely needing some land acquisition. These processes take time, which is why we are proposing an interim measure.

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  •   Why can’t you put in traffic lights?

    Traffic lights are not a quick solution and would require a larger footprint and cost significantly more than we have budget for as an interim solution. They are not within scope of this short-term work. 

    As part of our long-term work, a roundabout was the preferred choice for the community.

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  •   Why don’t you put in dynamic lanes on SH16?

    Dynamic lanes are not recommended on a high-speed network, which SH16 is considered as. Safety is the key consideration for this project, and safety risks increase on dynamic lanes when there are access ways on both sides of the corridor and at intersections. There are also increased safety risks for on-road cyclists.

    Dynamic lanes also require additional land which comes at a cost. This would not be a quick solution, nor is it within scope or budget of the project.

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