Why so many roads have “Trail” in their name in Calgary?

Why so many roads have “Trail” in their name in Calgary? I don’t know why roads have “Trail” in their name. I made a list of all the roads that have Trail in their name.

Stoney Trail Deerfoot Trail Airport Trail NE Metis Trail NE Barlow Trail Glenmore Trail Macleod Trail Crowchild Trail Sarcee Trail Bow Bottom Trail SE Bow Trail SW Blackfoot Trail SE Shaganappi Trail NW Beddington Trail NW Peigan Trail SE Edmonton Trail

Please let me know why Calgary has the word Trail in a lot of its road names.