The accidents occurred within 10 minutes of each other just before noon.

The first occurred on Holwell Road, Beaconsfield, at 11.40am when a rider failed to take a left-hand bend after a hill crest, separating him from a convoy of 15 other motorcycles, travelling from Ulverstone to George Town.

The 50-year-old Squeaky Point man slid for 60 metres on his right side before he hit a wooden fence.

He was treated at the scene for a large laceration to his forehead and other minor injuries and was taken by ambulance to the Launceston General Hospital in a serious condition.

Inspector Darren Hopkins said that the man had been travelling at an excessive speed for the corner.

Minutes later, North-West police and emergency crews were called to a collision between two motorcycles on Loongana Road, Nietta, at 11.50am.

Three people were taken to the North-West Regional Hospital with non-life threatening injuries, one man with concussion.

Inspector Hopkins said it was strange for two motorcycle accidents to happen so close together in separate parts of the state.

He said that motorcycle accidents were not common in summer.

``Although the main problem with this time of the year is that we get long, hot, dry weather and as soon as we get rain, the roads become very slippery,'' Inspector Hopkins said.

Tasmanian Motorcycle Council president Shaun Lennard last month said high-visibility policing and advertising campaigns had helped to reduce the number of motorcycle accidents on Tasmanian roads.

He said there were three motorcyclist deaths in last year's road toll - the lowest since records began in 1967.

The most recent was on December 30 when Shearwater man Philip Eric Haines, 45, died when his motorcycle slammed into a ute on Union Bridge Road near Sheffield.