Update, 4.49pm: State Highway 2 has reopened following a crash between a car and motorcycle earlier in the Karangahake Gorge.

Motorists are advised to expect delays until traffic eases.

Earlier, 4pm: Police are at the scene of a serious car and motorcylist crash on State Highway 2, Karangahake.

NZTA advise that the state highway has been closed due to the crash in the Karangahake Gorge between Paeroa and Waihi.

Police were alerted to the crash at around 3:25pm. One person is said to be seriously injured.

A traffic detour is in place.

For the Eastbound detour towards Waihi, motorists are advised to turn right onto SH26, turn right onto SH27, turn left onto SH24, continue onto SH29, turn left onto Cambridge Rd, turn left to re-join SH2.

Westbound detour (towards Paeroa) is advised to follow the same as above, only in reverse

NZTA advice motorists to follow the directions of emergency services at the scene.

It is unknown how long the road closure is expected to be.

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