State Highway 39 (New Zealand)
State Highway 39 is a New Zealand state highway that forms a western bypass of the city of Hamilton. Gazetted in 1999, it is a generally quicker route to get between Auckland and New Plymouth as well as connecting to the Waitomo Caves, just south of the SH 39 southern terminus. The southernmost 14 km section has a concurrency with, as this highway has existed for much longer.
Route
SH 39 begins at on the Te Rapa section of the Waikato Expressway at Koura Drive, just north of the city of Hamilton. It shifts south briefly before reaching a roundabout junction where it follows Te Kowhai Road westbound, eventually changing to Limmer Road. At the intersection of Horotiu Road SH 39 veers south until the intersection with at Whatawhata. It shares a brief concurrency, turning left into SH 23, then immediately right back onto SH 39 southbound. Following Kakaramea Road, the highway passed through Ngāhinapōuri then the township of Pirongia. After Pironga the state highway intersects SH 31 to Kawhia. For the final 14 km the road is jointly designated SH 31 and SH 39 before terminating in the town of Ōtorohanga with SH 3.SH 39 is classified as an 'arterial' highway under the One Network Road Classification.
The traffic flow records indicate that through traffic forms about half the flow, with traffic from Hamilton via SH 23 adding to the flow through Whatawhata and via Temple View and Tuhikaramea Rd adding to the flow through Ngāhinapōuri and from Kawhia adding a little to the flow at the southern end of SH 39.
| Location | 2011 | 2012 | 2013 | 2014 | 2015 | % Heavy vehicles |
| east of Te Kowhai | 1572 | 3243 | 3761 | 13 | ||
| north of Whatawhata | 5062 | 15 | ||||
| north of Tuhikaramea Rd | 3133 | 3152 | 3020 | 2918 | 3230 | 19 |
| Ngāhinapōuri | 5503 | 5413 | 5430 | 5500 | 5666 | 15 |
| Puketotara | 3166 | 3202 | 3243 | 3269 | 3545 | 17 |
| before SH 31 Intersection | 2456 | 2503 | 2666 | 2589 | 2801 | 20 |
| after SH 31 Intersection | 2576 | 2714 | 2755 | 2781 | 2929 | 20 |
Route changes
SH 39's northern stop has changed. In 2013 after the completion of the Waikato Expressway, Ngāruawāhia Section, used to travel through Ngāruawāhia and Te Kowhai further north than currently. After the expressway was completed, the Waikato Expressway become the new SH 1 as it is a faster route. SH 39 was diverted away from Ngāruawāhia to its current terminus at Te Rapa. The current route was temporarily designated SH 39A whilst it was being upgraded to highway status and in June 2014 this section become SH 39 and the old section revoked.In July 2022, upon opening of the Hamilton section of the Waikato Expressway, SH 1 moved from its location via Mangaharakeke Drive onto the expressway. The old designation of SH 1 through Hamilton was renumbered SH 1C.