A woman has died following a single-vehicle crash on State Highway 1 at Ohinewai.
The vehicle collided with a barrier and came to rest on a rail line about 1.10am, says a police spokesperson.
"The woman was taken to Waikato Hospital where she later died.
"A diversion at Tainui Bridge remains in place this morning for northbound traffic.
"Rail services are expected to resume after 6am."