Vehicles using the Princes Motorway on-ramp at Five Islands Road for northbound traffic have to negotiate a tight curve that loops onto the M1.

The on-ramp also has a camber that leans into the curve, which some have suggested creates issues for trucks carrying tall or loose loads.

Just after 10am on Tuesday a semi-trailer making that tight turn rolled over just before reaching the Princes Motorway.

The driver was treated for face and head lacerations, while the on-ramp was closed to traffic through to the evening peak.

The closure was to allow crews time to remove the overturned truck but also repair the road surface which was damaged in the incident.

The M1 Princes Motorway on-ramp was finally reopened to traffic around 5.30pm on Tuesday.

In recent years at least one other truck has overturned while trying to make that tight turn.

On October 6, 2015, a truck from Port Kembla-based Murrell Freight Lines flipped in almost the same spot at the tail-end of the morning peak.

The driver was unhurt in the accident, but the on-ramp had to be closed for several hours while the truck was removed by a heavy tow-truck.

“He just said it [the load] moved,” a company spokesman said.

A spokeswoman from Roads and Maritime Services said the government body was aware of Tuesday’s accident.

The spokeswoman did not respond to a question about whether the body had identified any issues with the on-ramp.

“Roads and Maritime Services regularly monitors all state roads to maintain the safety and the efficiency of the network,” the  spokeswoman said.

“At this location there are large signs warning motorists to slow down to the advisory speed limit of 45km/h.”

The spokeswoman refuted claims there was an issue with the camber of the road, which is designed in part so that water will not pool on the road surface.

“The curve radius of the ramp is considered to be appropriate for all motorists, including heavy vehicles,” the spokeswoman said.