State Highway 2 Karangahake Gorge will be closed overnight next week for road resurfacing.
The highway will be closed between 8pm and 5am on Monday February 15 and Tuesday February 16.
Signage and cordons will be in place between Paeroa and Waihi.
Waikato System Manager Cara Lauder said detours for this route were significant and encouraged motorists to plan their travel for outside closure times, where possible.
"The southbound detour takes motorists south on SH2 from Waihi to Tauranga, then onto State Highway 29 over the Kaimai Range, State Highway 24 to Matamata, State Highway 27 to Tatuanui and State Highway 26 to Paeroa.