FIVE days of carnage on Northern Rivers roads has claimed the lives of seven people in six separate smashes.
The latest crash claimed the life of a man aged in his 40s when his motorcycle collided with a dump truck on the Summerland Way yesterday afternoon.
Senior police said they had never seen so many people killed in such a short period of time.
Richmond Local Area Command duty officer Inspector Bill McKenna said the message did not seem to be getting through.
"Slow down," he said.
The crash occurred at about 3pm just a few kms south of Casino when the north bound motorcyclist rounded a sweeping bend and collided with a dump truck that was turning right.
Police, fire brigades and NSW ambulance paramedics attended the scene.
Local traffic diversions were put in place and heavy vehicles were diverted along the Pacific Highway at Grafton.
Detectives from the Ballina Crash investigations examined the scene trying to determine the cause of the crash.
The crash comes after a 23 year-old Palmers Island woman was killed this morning when the car she was driving hit a cement truck on Yamba Road at Yamba.
Two people died on Tuesday night, when a pedestrian was hit by a car on the Pacific Hwy at Glenugie and 18 year-old Casino man Kyle Yates was killed when the car he was driving hit a tree at Naughtons Gap.
Three people were killed in two crashes on Monday - Casino's Robert Needham and Warren Endres died when the car they were in and another car collided on the Summerland Way at Leeville and 50 year-old Kempsey man whose car crashed into a guard rail on the Pacific Hwyat Woodburn.
Richmond Local Area Command crime manager Detective Inspector Greg Moore said police were appealing for any witnesses to contact Casino police or Crimestoppers 1800 333 000.
"It is concerning that our initial enquiries into some of these collisions suggest that excessive speed," he said.