Canterbury
district road policing manager Inspector Natasha Rodley said the second vehicle, a silver 2004 Nissan Navara, left the scene before police arrived and is still outstanding.
Police are appealing for information from the public to find the vehicle. Inspector Rodley said they are following strong lines of inquiry to identify and locate the people and encourage them to come forward to speak to them.
"This is a tragedy, and a reminder that deaths on our roads are preventable.
"Police remind people that any travel during alert level 4 should be for essential purposes only."
Inspector Rodley said if people are on the road, they should remember to slow down, drive free from the effects of alcohol, drugs and fatigue, wear seatbelt, and minimise distractions.
Anyone who has any information which may assist is asked to call police on 105 and quote file number 210823/2767.