Police are appealing for sightings of a silver-coloured Nissan Bluebird prior to a fatal crash in Hawke's Bay.

Senior Constable Timothy Rowe said on Wednesday that police were hoping the public could help piece together what had happened in the lead-up to the single-vehicle crash near Taradale on Sunday night.

A man in his 70s died in the crash on Springfield Rd, between Napier City Council's Redclyffe Transfer Station and the Otatara Pa Historic Reserve.

It was reported at 11.56pm after the vehicle was discovered beside the road.

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There appeared to have been no witnesses and no evidence that any other vehicle was involved, Eastern Police District road policing commander inspector Matt Broderick previously told Hawke's Bay Today.

Rowe said three days on they still did not know what caused the crash or when it occurred.

"It's a really perplexing one.

"It's a busy road so at the moment we're trying to narrow down the time of when the crash occurred and hopefully that will help us piece it together."

They would like to talk to anyone who travelled along Springfield Rd on Sunday evening, or who may have seen a silver-coloured Nissan Bluebird in the area.