Autoroute 55 (also called
Autoroute de l'Énergie north of the
Autoroute 20 and
Autoroute Joseph-Armand Bombardier south of it) is an important north-south
Autoroute and the only one running in that direction in central
Quebec. It is the longest north-south Autoroute, beginning as the continuation of
I-91 at the
Canada-United States border near
Stanstead and continuing to
Shawinigan, where it downgrades to Route 155. The total length of A-55 is currently long, including concurrencies with
Autoroutes 10,
20 and
40.