I don't think you can infer that people were using their preferred method just from the fact that they were using it - after all, the status quo was also the result of policy.
> IMO what they should be keeping a careful eye on and tracking is how many fewer trips happen to businesses in those areas.
I think the article mentions this?
> In March, just over 50 million people visited business districts inside the congestion zone, or 3.2 percent more than in the same period last year, according to the New York City Economic Development Corporation (its estimate tries to exclude people who work or live in the area).
See also the "Other business measures are doing OK so far" heading.
> IMO what they should be keeping a careful eye on and tracking is how many fewer trips happen to businesses in those areas.
I think the article mentions this?
> In March, just over 50 million people visited business districts inside the congestion zone, or 3.2 percent more than in the same period last year, according to the New York City Economic Development Corporation (its estimate tries to exclude people who work or live in the area).
See also the "Other business measures are doing OK so far" heading.