In addition to collecting place of usual residence and place of work, it would be useful to collect 'place of location' at a certain time on census day. For example, where were you at 10AM on Census day? This would provide Govt with an invaluable centralised information source to inform transport planning. While the work location is useful for the 11m of so people employed, this question would help capture the other half of the population who are at home, or who travelled to other locations.