"It was after I had come around the first bend of Farndon Rd towards Hastings I noticed multiple cars pulled over at different places with their hazard lights on. I didn't see them physically fighting but it looked like something was going on."
Andy Green also saw the incident when he was driving to rugby training at Clive Rugby Club.
Mr Green said he saw two men in an altercation on the side of the road and cars were flicking their lights to warn drivers.
Police closed Farndon Rd for a time while they searched the area and people were not able to access Clive War Memorial Pool.
Residents in Clive said they saw police with large flashlights driving past their houses multiple times and were advised to stay indoors and call 111 if they saw anything suspicious.
It is understood a tourist was picking up a hitchhiker before the altercation occurred involving the tourist's car on Farndon Rd.
A spokeswoman said police were following a strong line of inquiry.