About 5:50 pm on Saturday 16 September 2017, a motorcycle travelling north on West Tamar Highway failed to negotiate the roundabout at Acropolis Drive.

The rider, a 41 year old male, was conveyed to the Launceston General Hospital in a critical condition and later flown to the Royal Hobart Hospital.

Initial investigations indicate that speed may have been a factor in the crash.

Police would like to speak with any person who witnessed a black, late model Harley Davidson motorcycle travelling in a northerly direction on the West Tamar Highway between Riverside and Legana around the time of the crash.

Information can be provided anonymously by calling Crime Stoppers on 1800 333 000 or online at crimestopperstas.com.au