Альберта провинциялық 1A тас жолы және Боу-Вэлли жолы

Designation for two disconnected sections of provincial highway in Alberta, Canada

Alberta Provincial Highway No. 1A is the designation of two alternate routes off the Alberta portion of Trans Canada Highway 1. However, it is not the only name used for spurs off Highway 1 Highway 1X is another such designation. Despite these highways being suffixed routes of Highway 1, they are not part of the Trans Canada Highway network, and are signed with Alberta's provincial primary highway shields instead of the Trans Canada shields used for Highway 1.

The Lake Louise to Banff section of the Banff National Park 1A route is also known as the Bow Valley Parkway. It begins at Highway 1 at Lake Louise, generally paralleling it until it meets Highway 1 again approximately west of Banff. It provides more immediate access to attractions in Banff National Park such as Castle Mountain and Johnston Canyon. This spur has a reduced speed limit of , and provides opportunities to view wildlife at various times of the year. Parks Canada introduced planned and marked pullovers along the route to enhance and educate visitors about the region. The Bow Valley Parkway is one of only two parkways between Lake Louise and Banff, and the only one that allows views of the mountain scenery, waterfalls, and various view points of the nearby rivers and creeks. It was the original highway that connected the valley and is advertised as a "year round scenic heritage experience". Parks Canada enacted seasonal travel restrictions along the Bow Valley Parkway on a segment between the Johnston Canyon Campground and the Fireside Picnic Area (adjacent to the Highway 1 eastern junction). From March 1 to June 25, travel is not permitted between 8 p. m. and 8 a. m. in order to protect wildlife. Highway 1 can be used as an alternate route.

The second of the 1A routes, known as the Bow Valley Trail, begins in Canmore, off of the Trans Canada Highway at exit 91. It formerly began at the Trans Canada Highway at exit 86 and passed through Canmore; however, ownership of the section was transferred to the Town of Canmore. The roadway still carries the name "Bow Valley Trail". The lake also supplies most of the water power for Calgary through TransAlta Utilities. Highway 1A meets northbound Highway 40 approximately after passing Ghost Lake. From Highway 40, Bow Valley Trail proceeds towards the east, and then slightly to the southeast, before reaching the Town of Cochrane, where it intersects with Highway 22. There, the highway widens to 4 lanes as it leaves Cochrane and proceeds southeast until it reaches Calgary, meeting northbound Highway 766 about west of the city limits. Upon reaching the Calgary city limits at 12 Mile Coulee Road, it continues as Crowchild Trail, a major north south expressway, (although it travels in a southeasterly direction from the city limits to 24 Avenue NW) through the northwest and southwest parts of the city. Within Calgary, it crosses Stoney Trail (Highway 201) as well as a number of major streets, before reuniting with the Trans Canada Highway (known as 16 Avenue N) near McMahon Stadium and the University of Calgary. The section along Crowchild Trail is maintained by the City of Calgary rather than Alberta Transportation. Before 1972, this route was the only road to Banff National Park.

When initially constructed, the Icefields Parkway was designated as Highway 1A between Lake Louise and Jasper. The route was renumbered to Highway 93 in 1959.

A former section of Highway 1A exists along the former Kicking Horse Trail, the original road between Lake Louise and Golden, British Columbia that opened in 1926. When the Trans Canada Highway was realigned in 1962, the segment became Highway 1A. It began at British Columbia Highway 1, west of the Alberta border in Yoho National Park. It meandered eastward through Kicking Horse Pass to Lake Louise, generally paralleling the main Highway 1 and CPR rail line to the south.

Highway 1A used to be an alternate route that followed 17 Avenue SE in Calgary and linked with Highway 1 in Chestermere. It began at Highway 2 (Deerfoot Trail) and Blackfoot Trail interchange and continued east along 17 Avenue SE where it passed through the former town of Forest Lawn. It crossed 116 Street SE, entering Chestermere and terminated at the Highway 1 interchange. It was dropped by the province in 2013 and the section within Chestermere was renamed to Chestermere Boulevard. As of 2016, remnant Highway 1A signage still remains on Deerfoot Trail and sections of 17 Avenue SE within Calgary; however, it has been removed along Stoney Trail, through Chestermere, and along the Trans Canada Highway.

The existing Bow Valley Trail / Crowchild Trail section and former 17 Avenue SE section of Highway 1A used to be connected by following a series of streets through inner city Calgary. From its present terminus, Highway 1A followed 16 Avenue NW east and was cosigned with Highway 1 to 14 Street NW. Highway 1A turned south, and after crossing the Bow River using the Mewata Bridge, and then branches east at its interchange Bow Trail. Highway 1A passed through downtown Calgary on a pair of one way streets, with eastbound traffic following 9 Avenue S and westbound traffic following 6 Avenue S. East of 6 Street SE, both directions of Highway 1A followed 9 Avenue SE, crossing the Elbow River on the Inglewood Bridge and passing through the community of Inglewood, linking with eastern section of Highway 1A by either using 16 Street SE and Blackfoot Trail, or directly along 17 Avenue SE. This section of Highway 1A was dropped in the 1970s.