One person is in critical condition following a motorbike crash.

Emergency services are responding to a crash involving a motorcycle on Tuakau Bridge-Port Waikato Road, Waikato.

Police were alerted to the single-vehicle crash around 8.20am, says a police spokesperson.

"Initial indications are one person has received critical injuries.

"The Serious Crash Unit are at the scene and motorists are asked to avoid the area if possible."