VICROADS is investigating a pothole on the Western Highway between Horsham and Pimpinio after a traffic cone was placed at the site.
Horsham's Jock Baker said he noticed the traffic cone in the middle of the road when driving on Friday and notified VicRoads.
"I had been driving through the pothole every day going to work," he said.
"But when I went though on Friday someone had put a sign up with a witch's hat on the road.
"I called VicRoads and they couldn't believe it.
"They fixed the pothole that day but it has ripped back open again."
Mr Baker took a photo of the pothole and sent it to the Mail-Times.
He said a car and a truck almost collided when he was taking the photo as they tried to avoid the cone.
VicRoads regional director Ewen Nevett said the group sent a maintenance crew to the site immediately after receiving Mr Baker's call.
He said recent wet weather had increased the number of potholes on the arterial road network.
"In this case, maintenance crews have been inspecting the site at least twice a week and undertaking temporary repairs as required," he said.
"More permanent patching works will be programmed once the weather improves and conditions are suitable."
Mr Nevett said signs were in place on the side of the highway to warn motorists of the road condition.
"VicRoads is investigating this site and may consider the installation of temporary reduced speed signage until more permanent repairs can be programmed," he said.
"VicRoads discourages members of the public from placing traffic cones or other objects on the road as it is a distraction for drivers and creates a safety risk."
Mr Nevett said people could report road hazards by calling 13 11 70.