The driver of the vehicle told Hawke's Bay Today the accident was on a grass area, well off the highway.
The driver said the vehicle had rolled while it was travelling at 15kmh/20kmh after the driver had accelerated, switching from 4WD to 2WD.
The group had got out of the car and were able to walk to the nearby ambulances.
Everyone was OK, apart from some 'bumps and bruises', the driver said.
Four ambulances attended the crash. Police are investigating the cause.
About six hours later, three people were injured, one critically and one seriously, after a car crashed into a shop in Hastings in the early hours of Wednesday morning.
Meanwhile, emergency services were called to the crash at the intersection of Duchess Cres and Karamu Rd North, in the Hastings suburb of Mayfair, about 12.45am on Wednesday.
And at about 8.20am there was a nose to tail crash on State Highway 2, near Poukawa, Hastings. There were no injuries.
Police said one driver was given a ride home as their car needed to be towed.
Less than half an hour later, at 8.41am, a truck hit railway barrier arms, causing concrete to obstruct the tracks on Awatoto Rd, Napier.
Police said KiwiRail crew attended to fix the barrier arm and remove debris.
Drivers were also disrupted when phone lines came down across the eastbound lane on Meeanee Rd, Napier, at 9.41am.
Police said traffic was diverted and contractors were on the scene to fix the lines.