This means remote working when the job allows for it, and for jobs that are unsuitable for remote work designing cities so that employees can live closer (ie within walking distance) of their workplaces.
There have been studies of remote workers that found they don't actually travel less. As I understand it, people use their commute to chain trips for other purposes. Without the commute, those trips get made individually. In many cases people actually drive more.
There is a reason central cities exist. They are very efficient. One of those efficiencies is lost when you rely on single occupancy vehicles instead of mass transit and walking.
Trains do a great job of comfortably moving large numbers of people quickly. The areas around stations develop densely to take advantage of that and that density supports the other efficiencies.