What we proposed
We proposed to create an intersection speed zone (ISZ) for Longburn-Rongotea Road at the intersection with Number 1 Line. An ISZ is a form of variable speed limit where the speed limit on Longburn-Rongotea Road would be temporarily lowered to 70km/h whenever traffic was waiting at the intersecting roads.
What we heard
Most submitters were in support of the proposed ISZ for Longburn-Rongotea Road/Number 1 Line. They agreed that the intersection is dangerous and prone to accidents. The speed of vehicles approaching the intersection, failure to stop at the stop signs, and the time needed to safely cross the intersection were all cited as reasons why the ISZ was supported.
Some submitters were opposed to the proposal, arguing that the problem was not with the speed of the intersection but instead was related to driver skills and drivers not stopping at the stop signs. One submitter expressed limited support for the proposal, but was frustrated that the variable speed limit signs stay activated after the turning vehicles have exited the intersection.
We acknowledge the concerns about driver skills, but this assumes that we can only take one approach to addressing the issue. While the Council has no power to directly influence driver skills, it can contribute to making the intersection safer by installing the ISZ. Slower speeds around the intersection can significantly reduce the harm caused when accidents happen.
Several submitters made suggestions for different or further changes. Some suggested that physical treatment of the intersection was a better approach – a roundabout or other physical traffic-calming features. While a roundabout could be an effective approach to improving the safety of this intersection, the estimated cost of $4-6M is many times more than the estimated cost of $400k for an ISZ. Furthermore, this route is potentially affected by decisions for the Manawatū Regional Freight Ring Road (MRFRR). An ISZ could therefore be treated as an interim safety measure until the broader discussions about the route of the MRFRR have been concluded. An ISZ is also quicker and easier to install, and can be completed within months whereas a permanent intersection redesign that included a roundabout could take several years to complete.
One submitter suggested that installing speed cameras on either side of the Number 1 Line intersection could help. However, speed cameras are installed and managed by NZTA not the Council.
Several speed limit changes for other roads were suggested. However as these were not included in the Consultation Document, we are unable to make a decision on any speed limit changes for those roads. These suggestions will be considered as part of the next stage of our speed limits review programme.
One submitter suggested that the speed limit for Number 1 Line west of the intersection with Longburn-Rongotea Road should be lowered, as many drivers do not stop at the stop signs. However this approach – of progressively slower speed limits leading into an intersection – is not supported by NZTA as good practice. A better approach may be to install rumble strips or advisory signs to alert motorists to the approaching stop sign.
What we decided
The Council decided to confirm the proposal with no further changes.
Manawatū District Council (MDC) is the road controlling authority for Number 1 Line west of the intersection with Longburn-Roongotea Road. We have referred the submissions we received on this proposal to MDC and recommended that they give consideration to the issue.
We have referred to NZTA the suggestion to install speed cameras for this section of road.