Rakaia Highway is currently closed near the intersection with Chertsey Line Road following a crash.
The two-vehicle crash was reported at 3:10pm.
One person has been critically injured, a second person has minor injuries.
The train tracks are also blocked, Police have notified KiwiRail.
Diversions are in place at Wilkinson Road and Hatfield-Overdale Road.
Motorists are advised to avoid the area and expect ongoing delays.
ENDS
Issued by Police Media Centre