Pedestrian facilities include retail shops, museums, mass events (such as festivals or concert halls), hospitals, transport hubs (such as train stations or airports), sports infrastructure (such as stadiums) and religious infrastructures. The transport mode in such infrastructures is mostly walking, with rare exceptions.
The vast majority of people who visit pedestrian facilities walk while they are there
The context says that the primary mode of transportation in pedestrian facilities is walking, with only rare exceptions. Thus, the vast majority of people who visit walk while they're there. The computer likely didn't understand the logic. 