A motorcyclist has died in a fiery crash involving multiple trucks and a car on a busy Sydney motorway.
The multi-vehicle crash happened near the busy Heathcote Road offramp of the M5 motorway about 3.30pm on Monday.
"It is believed a motorcycle was involved in a collision with two trucks and a car," a spokeswoman for NSW Police told AAP.
"The male rider died at the scene."
AAP understands the bike burst into flames during the collision and all westbound lanes were closed.
Police investigations are underway.
The fatal crash comes just a few hours after another motorcyclist was thrown about 40 metres in the air and killed following a collision with a car in northern NSW.
The car was travelling west on the Gwydir Highway in Grafton and was attempting to turn right when it collided with the motorcycle.
A 60-year-old man was thrown from the motorcycle and landed almost 40 metres from the collision. He died a short time later en route to hospital.
Meanwhile, a man who had been watching the Floyd Mayweather and Conor McGregor fight was found dead in his go-kart in a street near Tweed Heads in northern NSW.
It is believed the man crashed his petrol go-kart sometime on Sunday night, hitting a concrete median strip and veering off the road and into a driveway off Scenic Drive at Bilambil Heights, a NSW police spokeswoman told AAP.
A passer-by discovered the 34-year-old driver dead in the unregistered go-kart just after 6am on Monday.
The man had been watching the boxing match with friends, the spokeswoman said.
A crime scene was established as police investigate.