People who had tickets to the Air Force's 75th anniversary show at Ohakea in the Manwatu today, but were unable to enter due to the traffic chaos, will be refunded the ticket price.
A 30 kilometre-long traffic snarl up prevented thousands of people from attending the airshow. Some people were so put off by the congestion, they just decided to go home.
Police earlier attributed the traffic jam to a collision between a car and a motorcycle in the area around 9am, however a witness who passed the accident shortly after it occurred said the traffic began building up closer to the air base itself.
The queue increased as an estimated 60,000 people headed to Ohakea for the airshow.
By 10am, traffic was backed up at least 30km to Levin and beyond. It was still stalled at midday and police expected the problem to continue throughout the afternoon.