In the 1990s, the STO and the Communauté Urbaine de l'Outaouais had initiated plans to improve public transit in the Outaouais urban community as traffic problems were growing in several areas particularly in the eastern end of the city in the Quebec Autoroute 50 corridor as well as other bridges spanning the Gatineau and Ottawa Rivers. At that time, the CUO privileged existent railway corridors including the Canadian Pacific line in Hull and Gatineau for a future rapid transit corridor which would by-pass some the most congested areas of the city.