Nearly all people are pedestrians, and people in wheel chairs, or other such tools are part of that. As such, such travel must be the priority. Safe access for those modes should always be assured in urban environments. These modes do not increase noise or pollution and require very little in terms of extensive (and expensive) infrastructure. Next, bicycles are an inexpensive means to gain greater mobility, without significant public externalities. Along with pedestrians, there is personal health benefits (that in the Canadian system, have positive externalities, as savings are made to the public health services). Then, public transport as the most space-efficient mode with some positive health benefits as well. The last priority should be personal motor vehicles as these create significant danger to other users, require extensive and expensive infrastructure, produce pollutants to the air, water, and soil, and in exchange for these external costs give only personal gains. There is no public advantage to favouring such travel.
I am new to Montreal, but we (my family - three children <10) went for a hike across Summit Woods towards Beaver Lake. We did not realize that access would essentially be cut off by Côtes-des-Neiges road when we arrived there on Belvedere Rd. The motor vehicles traveling on that road effectively create a barrier, they steal the access to the park from people who choose (or must) use modes that are better suited for the urban setting. Cars are excellent for mobility, but they demand massive space and create danger. Those aspects mean that they must be controlled and restrained in most urban settings where they are integrated with people. Intra-city or rural travel is a different matter, but this is not a rural context, it is an urban one and the significant problems of car travel must be restrained.