An Air Force anniversary celebration is causing huge traffic problems on State Highway 1 in the Manawatu.
Traffic has been backed up for up to 10km on either side of the Ohakea Air Base, which is hosting an international air show as part of 75th anniversary festivities for the Air Force.
The 6.5km stretch of road between Bulls and Sanson, on which Ohakea is located, doubles as SH1 and SH3 and through traffic from the north, south, and between Whanganui and Palmerston North was being slowed.
Traffic mounted from about 9am and though it had eased off by about 1pm it was expected to rise again about 3pm when people left the air show.
A police communications spokesman said traffic had been backed up north of Bulls and south of Sanson.
Through traffic was advised to use detours, though they could be slow as the nearest crossing of the Rangitikei River to that at Bulls was about 8km to the north.
The Air Force said it was doing its best to get everyone onto the air base.
The show at Ohakea includes flybys by the Royal Australian Air Force's FA-18 Hornet fighters and the United States Air Force C-17 Globemaster transport aircraft.
There are static displays of military aircraft from Singapore and Australia and displays and flybys of historical warbirds such as the Spitfire, Mustang, Vampire and a Fokker DVII.
The RNZAF was set up in 1937 to provide trained pilots to Britain's Royal Air Force.
It no longer has an air combat wing, which was disbanded in 2001, ending the careers of the 17-strong Skyhawk fighter/bomber fleet and the 18-strong Aermacchi jet training fleet.
Most recently it took delivery of the $771 million French-built eight NH90 helicopters, which replaced the aging Iroquois helicopters.
NZN