Traffic is back to normal after a bad crash on the M1 at Mandalong overnight.
A southbound semi-trailer loaded with steel slammed into a slow-moving line marking truck at about 11 o'clock last night.
The two drivers escaped injury, however the motorway was closed for 4 hours while the crash scene was cleared.
Fire crews from Morisset and a Hazmat unit from Berkeley Vale cleaned up 400 of litres of diesel and 100 litres of hydraulic fluid from a 300 metre stretch of the motorway.
Police say the drivers returned negative roadside breath tests.
Investigations are continuing.
