A Surrey man is facing drunk driving charges after he was stopped by police while driving through Chilliwack on Highway 1 with an open beer in his hand and his 12-year-old son in his passenger's seat.

Two witnesses called police just before 8 p.m. Sunday evening to report that a white truck towing a boat was driving erratically on the highway.

The white 2007 GMC Yukon was reported to have been weaving between the lanes of the highway, straddling the centre line and driving at inconsistent speeds.

When a Chilliwack RCMP officer pulled over the vehicle, the Mountie found the 57-year-old driver with an open can of beer in his hand. The man's son was sitting in the passenger and "scared and emotional upon his father's arrest," according to police.

Mounties say the boy reported that the pair were driving home after a weekend spent at Adams Lake near Kamloops. The boy was taken to his grandmother's house in Abbotsford following his father's arrest.

The man was later released on a promise to appear in court at a later date.

"As a parent you have responsibilities and this kind of thing is very upsetting to hear about," said Cpl. Tammy Hollingsworth.

"Thanks to the woman and off-duty police officer who witnessed this impaired driver, for had they not called to report this incident the story could've ended very differently."