4.06pm update: State Highway 2 through Karangahake Gorge has now reopened following a serious crash.

"The road is now open. Please be patient and take care. Waka Kotahi thanks motorists for their patience," says Waikato System Manager Cara Lauder.

One person has been seriously injured following a vehicle collision involving a pedestrian and car at 12.28pm.

SH2 was closed until 4pm.

1.54pm update: Waka Kotahi NZ Transport Agency advises State Highway 2 is closed through the Karangahake Gorge, between Paeroa and Waihi, due to a serious crash.

One person is seriously injured following a vehicle collision involving a pedestrian and car at 12.28pm.

Waikato System Manager Cara Lauder says detours for this route are significant and encourages people to delay their travel, 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. Motorists travelling from Paeroa take the same route, in the opposite direction," says Cara.

'Northbound, motorists travelling from Waihi should take State Highway 25, turning onto State Highway 25A (Kopu-Hikuai Road) and then State Highway 26 between Kopu and Paeroa, with motorists travelling from Paeroa taking the same route, in reverse."

Cara encourages people to visit the interactive Waka Kotahi Journey Planner website (journeys.nzta.govt.nz) for the latest information on the road closure and detours, before setting off.

Waka Kotahi thanks motorists for their patience.

Plan ahead for a safe, enjoyable journey. Keep up to date with:

• Traffic updates:journeys.nzta.govt.nz/traffic
• Facebook: facebook.com/NZTAWaikatoBoP
• Twitter: twitter.com/WakaKotahiWaiBP
• Journey planner: journeys.nzta.govt.nz
• Phone: 0800 4 HIGHWAYS (0800 44 44 49)

1.40pm update:

State Highway 2 at Karangahake is closed following a serious crash involving a pedestrian and a car.

Emergency services are responding to the crash.

One person is reported to be seriously injured.

NZTA advise that due to this serious crash, State Highway 2 is closed between Paeroa and Waihi.

Motorists are asked to avoid the area if possible as delays are expected.

Earlier:

There has been a serious crash on State Highway 2 at Karangahake.

Police were notified of the vehicle collision involving a pedestrian and car at 12.28pm.

One person is reported to be seriously injured.

Motorists are cautioned that there may be some delays and to take care near the scene.

At the scene? Phone 0800 SUNLIVE or email newsroom@thesun.co.nz