Although those of us who live here like to complain about the traffic, it's not really that bad when compared to most cities of a similar size. Rush hour traffic starts to build after 3:30.

Personally, I would exit the airport and take Airport Trail to Deerfoot Trail and exit Deerfoot onto 16th Ave (Trans Canada HWY) and stop a Shell station with a Scotiabank ATM such as this one which is just off 16th Ave on your way to Banff and on the same side of the street.

Scotiabank Shell Abm
1820 Uxbridge Drive Nw
Calgary, AB, T2N3Z1

This is no way to go around Calgary...you have to drive through it...and unfortunately for you the East-West route is the slow one.

Enjoy Banff and Jasper...the weather forecast is excellent!