Mr Collier was a passenger in the car he had hoped to buy
A car enthusiast who travelled more than 50 miles to buy a hatchback was killed when it crashed on a test drive.
Gavin Collier, 20, from Neath, was a passenger in the Peugeot 106 Rallye which was being driven by the owner last Wednesday.
Mr Collier had seen it advertised on the internet and travelled to Tenby, Pembrokeshire, for a road test.
Police said the driver lost control on the A4139 at Penally and hit a parked car before crashing into a wall.
The 23-year-old driver was airlifted to hospital and was in a serious condition but is expected to survive. Mr Collier was killed instantly.
Police plan to interview the driver when he is fit enough to give a statement about the crash.
Mr Collier was hoping to buy the car as a 21st birthday present and had travelled to Tenby with a friend to see the vehicle.
His friend was waiting for him on the test drive when he saw an air ambulance flying to the scene of the wreckage.
More than 1,800 people have left tributes on an internet networking site set up in Mr Collier's memory.
The student would have been 21 on Monday and friends were planning a birthday party.
He was an only child whose mother had died from cancer when he was a teenager. His father, Jonathan, is an electrician at a hospital.
A family friend said: "It is very hard on Jonathan and it is absolutely heartbreaking just before his 21st.
"He is devastated. All we know is that he was a passenger in a car when he was killed.
"Gavin loved life and loved his cars. Life is cruel but now he is in a happy place with his mum to look after him."
Mr Collier's friends are planning to stage a lap of honour at an annual car show for Peugeots and Citroens held every summer in Northamptonshire.
He was a regular contributor to a website dedicated to Citroen Saxo cars.
Dyfed Powys Police are appealing to other motorists who saw the Peugeot moments before the crash to come forward.
A spokeswoman said: "A blue Peugeot 106 was travelling towards Tenby, when it appears to have lost control and collided with a stationary vehicle parked at the roadside.
"As a result, a 20-year-old male received fatal injuries. The next of kin have been informed.
"The driver of the Peugeot was airlifted to hospital, where he is described as being in a serious but stable condition."