There are many roads in the southwestern part of British Columbia and Vancouver Island that were designated as Highway 1A.

Chemainus Road and Highway 1A turns northwest, and goes for 15 km (9 mi) through Chemainus to the intersection with Roland Lane, where it subsequently turns west to meet the Trans-Canada Highway on the south end of Ladysmith.

The new DriveBC Beta website displays the most "recent" alignment of highway 1A as a complete, official signed highway route from its shared alignment with 99 north of the Lions Gate through Vancouver, New Westminster, Surrey, and the Langley Bypass to its junction with BC 1 in Abbotsford.

99A is shown in concurrency from the 1A junction to the Lions Gate but not down King George blvd to the border.

In 2005, the City of Chilliwack posted signage along the Yale Road East section designating it as the "Trans-Canada Parallel Route".

A former section of Highway 1A exists along the former Kicking Horse Trail, the original road between Lake Louise and Golden that opened in 1926.

[9] It began at Highway 1, 3 km (1+3⁄4 mi) west of the Alberta border in Yoho National Park and meandered eastward through Kicking Horse Pass to Lake Louise.

The route is now closed to vehicle traffic and is part the Great Divide hiking trail.