Waka Kotahi intends to implement a speed limit bylaw for the southbound section of the new Transmission Gully motorway, approaching the southbound merge at Linden, through to the existing SH1 motorway at Helston Road (just north of Johnsonville). This is proposed to be a variable speed limit (VSL) to safely manage southbound traffic where SH1 and SH59 merge, and to ensure safety and efficiency on the section of SH1 to Helston Road.
This would extend the existing VSL currently in place on SH1 from Helston Road to the Terrace Tunnel, all the way to the southern end of Transmission Gully.
A VSL allows the motorway operator to adjust the speed limit to manage incidents on the road or adverse weather conditions that may affect safety of road users. It can also be used to slow vehicles down if there is congestion ahead, or for temporary traffic control.
Electronic VSL signs would be progressively installed, however Waka Kotahi expects to temporarily use static signs approaching the Linden merge point between SH1 and SH59 until it is comfortable with how the network surrounding Transmission Gully is working.
All other proposals in this consultation are to ensure that vehicles are travelling at safe and appropriate speeds when using on and off-ramps connected to the motorway and other sections of state highway. These proposed changes are detailed in the table below.