Gordon Buchan was last seen around 1pm on Sunday, March 1 in Kyle of Lochalsh.
Searches for the 55-year-old have been ongoing in the Skye and Lochalsh area.
Police have since found his light blue Citroen C4, registration RO06 KFU, in Kyleakin on the opposite side of Skye Bridge.
Coastguard, RNLI, mountain rescue teams and specialist police officers have been involved in the search so far.
Mr Buchan is 5ft 10ins tall and of medium build with short, dark greying hair. When last seen, he was wearing blue jeans, a grey t-shirt and green waterproof jacket.
Inspector Lynda Allan, who has been co-ordinating the searches, said: "Despite extensive searches, Gordon remains missing at this time and we are naturally growing increasingly concerned for him.
"Anyone who may have seen him at any time since early on Sunday afternoon or who may have seen since vehicle on the road to let us know as soon as possible.
"I would also ask local residents to be vigilant and report anything which may be of use to us.
"I would also take the opportunity to thank the various partner agencies who have assisted with the search for their tireless efforts so far."
Anyone with information can contact police on 101, quoting incident 1739 of 2 March.