Merseyside Police can confirm a 39-year-old man from Maghull was arrested on Wednesday, 11 April following an incident in Maghull.
At around 11am an officer from the roads policing unit stopped a motorcyclist on Gorsey Lane in Litherland, as the officer suspected the motorbike was being used without a valid MOT or road tax.
The motorcyclist then assaulted the officer, before PCSOs and members of the public stepped in.
The man was arrested on suspicion of assaulting a police officer and other motoring offences. He was taken to a police station and has been released pending further enquiries.
The officer suffered cuts and bruises and remained on duty.
Acting Chief Inspector Keith Kellett from the Roads Policing Unit said: “Thankfully the officer was able to remain on duty and suffered only minor injuries, and we’d like to thank the members of the public and other officers who came to his assistance. This officer was simply trying to do his job and I’m sure the public would agree that officers who are keeping our roads safe, should not be subject to behaviour like this.”