A 27-year old man is in the intensive care unit following an early morning crash in Welcome Bay on Tuesday morning.

The single-vehicle collision occurred on Welcome Bay Road, near James Cook Drive shortly after 3am.

Diversions were in place with the road re-opening around 5.50am.

A Bay of Plenty District Health Board spokesperson says the 27-year-old is in a stable condition in Tauranga Hospital's intensive care unit.

A police spokesperson says an investigation is ongoing regarding the circumstances of the crash.

People who witnessed the crash, and haven't already spoken with police can contact Tauranga Police Station on 07 577 4300.

Alternatively, information can be left anonymously via the Crimestoppers 0800 555 111 line.