| Province: | AB |
| Type: | Hwy |
| Route: | 40 |
| Alternate Name: | Bighorn Highway, Kananaskis Trail, Forestry Trunk Road |
| Maint: | Alberta Transportation |
| Map: | Alberta Highway 040.png |
| Length Notes: | Two sections: and |
| Direction A: | South |
| Direction B: | North |
| Section1: | Crowsnest Pass segment |
| Length Km1: | 3.8 |
| Terminus A1: | in Coleman |
| Terminus B1: | Forestry Trunk Road north of Coleman |
| Section2: | Kananaskis Trail segment |
| Length Km2: | 104 |
| Terminus A2: | in Highwood House |
| Terminus B2: | south of Seebe |
| Section3: | Forestry Trunk Road segment |
| Length Km3: | 46 |
| Terminus B3: | north of Waiparous |
| Section4: | Northern segment |
| Length Km4: | 434 |
| Terminus A4: | south of Coalspur |
| Junction4: | in Coalspur in Hinton |
| Terminus B4: | in Grande Prairie |
| Rural Municipalities: | Crowsnest Pass, M.D. of Ranchland No. 66, Kananaskis I.D., M.D. of Bighorn No. 8, Rocky View County, Yellowhead County, M.D. Greenview No. 16, County of Grande Prairie No. 1 |
| Cities: | Grande Prairie |
| Towns: | Hinton |
| Previous Type: | Hwy |
| Previous Route: | 39 |
| Next Type: | Hwy |
| Next Route: | 41 |
| Restrictions: | Annually closed between Peter Lougheed Provincial Park and Hwy 541 from December 1 - June 14.[1] |
Alberta Provincial Highway No. 40, commonly referred to as Highway 40, is a south–north highway in western Alberta, Canada. It is also named Bighorn Highway and Kananaskis Trail in Kananaskis Country. Its segmented sections extend from Coleman in the Municipality of Crowsnest Pass northward to the City of Grande Prairie and is currently divided into four sections.[2]
The southernmost section is gravel; it runs for through the Municipality of Crowsnest Pass, where it then becomes the Forestry Trunk Road to Highway 541, which has a combined length of .
The second section of Highway 40 is Kananaskis Trail, which is paved and runs through Kananaskis Country for from Highway 541, over Highwood Pass, and through Peter Lougheed Provincial Park and Spray Valley Provincial Park. The highway passes Kananaskis Village before terminating at the Trans-Canada Highway (Highway 1).
The third section is gravel and is part of the Forestry Trunk Road, which runs from Highway 1A to Highway 579. The highway continues as the Forestry Trunk Road and Highway 734 for approximately, through the Rocky Mountains Forest Reserve. The intention is that one day the entire road will be a continuous paved highway. In the past, other gravel sections were named Highway 940; the 900 series in Alberta is used for temporary names. There is no signed connection between the Kananaskis Trail section and the Forestry Trunk Road section; however, it is connected by using Highway 1, Highway 1X, and Highway 1A between Seebe and Ghost Lake.
The fourth section is and runs from the Lovett River in Yellowhead County to the City of Grande Prairie. The section south of Cadomin is gravel while the remainder is paved. The highway shares concurrency with the Yellowhead Highway (Highway 16), before continuing north and passing through the Hamlet of Grande Cache en route to Grande Prairie.
Starting from the south end of Highway 40: