OAHU, Hawaii -- One woman is dead and another was critically injured in a motorcycle crash Sunday.

Police blocked off a portion of Kaukonahua Road in both directions on Oahu's north shore at about 12 p.m.

Traffic investigators said the driver of the motorcyclist lost control and crashed into the guardrail.

Both the driver and her passenger were ejected from the bike.

Police said the posted speed limit is 25 mph and the driver was speeding.

"The thing about speed limits is not something you can ignore. It's what engineers have figured out based on the curvature of the road, the incline the surface. It's what your vehicle can handle if you go too far past that you breaking the laws of physics," said Lt. Darren Izumo, with the Honolulu Police Department.

The 27-year old driver died at the scene. Her 23-year old passenger was taken to the hospital and police said her condition has improved.

Police said both women were wearing helmets and were travelling with a group.