THERE are lots of rules to staying safe on the road but perhaps the most important is also the simplest: use your noggin.
It's a rule this rider seems to have forgotten as he blithely overtakes a lorry, incorrectly assuming he will find nothing in his way.
Dorset Police, who posted the video on Facebook, also aren't happy with the rest of his riding.
The force wrote: 'We've seen an increase in the number of bikers involved in collisions on Dorset roads.
'Please remember no one is invincible and things can go wrong in a split second.
'Watch the video to the end and let us know how many bad driving behaviours you see here.'
Luckily the rider escaped with a broken leg.
The force added: 'The rider of this motorcycle was lucky not to be more seriously injured after riding in the manner he was.
'He sustained a broken leg but fortunately did not go beneath the lorry. If you're on a motorcycle, ride carefully, within the speed limits and ride with consideration to other road users.'
Neither has the rider won praise in the comments on the video.
Andrea White wrote: The advert says Think Bike !! But some bikers take so many chances and drive without any consideration for other road users.. this rider should surly [sic] have been done for driving without due care and attention !!!!!'
Alison Crocker wrote: 'Please can we have a sticker for bikers that says THINK CAR!!'
Because drivers are all perfect, aren't they? Um...