Police are appealing for anyone who travelled the A82 overnight on Friday 29 September to come forward.
The police hope this appeal could lead to information on the whereabouts of missing man, Tony Parsons.
The 63-year-old left an address in the Ross Court area of Tillicoultry around 9.30am on Friday 29 September and travelled to Fort William by train. He arrived in Fort William around 4.10pm and it is believed he then set off to cycle back to Tillicoultry along the A82.
Officers are eager to hear from the driver of a people carrier-style vehicle that was seen travelling south on the A82 at around 2am on 30 September at the Green Welly Stop, Tyndrum.
The last confirmed sighting of Tony is at 11.30pm on 29 September at the Bridge of Orchy Hotel. He left that area and headed south, in the direction of Tyndrum.
Officer are appealing for drivers who travelled along the A82 between Bridge of Orchy and Tyndrum overnight on Friday 29 September to come forward with any information that may lead to Tony’s whereabouts.
Inspector Jo Jollie of Callander Police Station said: “We know that Tony was planning to cycle along the A82 south back to his home in Tillicoultry and have identified a number of vehicles that were travelling the route overnight on Friday 29 September.
“The driver of the car in the CCTV image might have passed Tony on his route or seen something that is of use to our investigations and we urge them to contact us immediately.
“I would also continue to appeal to anyone with further information that may lead to Tony’s whereabouts to contact police.”
Those with information can contact Police Scotland on 101, quoting incident number 559 of 2nd October.