Police say they found a zombie-style knife in a car which had crashed on the A52 Clifton Boulevard.
Police were called to the scene of the busy road at around 7.15pm on Friday, October 1.
One of the two vehicles involved had collided with a crash barrier and had severe front-end damage, according to the force.
As one of the officers on the scene tried to move the car he noticed a strong smell of cannabis and began a wider search of the vehicle.
A small quantity of cannabis was recovered inside and a large zombie knife was found in the boot.
A 23-year-old man was arrested on suspicion of possessing a bladed article, possession of cannabis and drug driving.
Police say the investigation is ongoing.
Anyone with additional information about this incident is asked to call 101 quoting incident 671 of 1st October 2021.