The Galway woman went missing in Dublin two weeks ago and the family have requested that the driver contact the gardaí, using the force’s confidential phone line if they wish.
The call comes as Garda sources say they do not believe the driver is a suspect in the financial services professional’s disappearance.
Ms Timothy has not be seen or heard from since being caught on CCTV camera footage hailing a taxi on Sir John Rogerson’s Quay at 8pm on Tuesday, December 14 shortly after she withdrew €60 from an ATM.
Despite a garda and family campaign to locate the driver of the dark Mercedes taxi no contact has been made. Information is being distributed among immigrant communities in case the taxi driver has not be monitoring media and is unaware of the search for Ms Timothy.
Her family last week launched a flyer campaign in an effort to find Blathnaid.
Gardaí have appealed for anyone who knows of her movements between 10am and 8pm on the day she went missing to come forward.
Ms Timothy’s sister Aoife Murphy said her movements were “a little out of character for her,” on that day.
“She left her apartment without her phone, without her handbag, and it appears she didn’t have an overnight bag with her.”
The number for the Garda Confidential Line is 1800 666111.
Anyone with any information on Ms Timothy’s whereabouts are asked to contact Harcourt Garda Station.