It's been a busy morning for emergency services -- with several crashes around the country

Part of State Highway 29A at Maungatapu in Tauranga is closed, after a two-vehicle crash that's left three people with moderate to serious injuries.

State Highway 27 is closed north of Matamata, after a truck believed to be carrying chemicals rolled and lost its load -- leaving the driver with serious injuries.

State Highway 35 north of Gisborne has fully reopened after a crash.

And State Highway 6 remains closed south of Winton, after a truck crashed, spilling bitumen onto the road.

Police say the Serious Crash Unit is investigating the crashes.