She built a methodology identifying people's needs using travel survey data, including data on mobility patterns and people's satisfaction with their trips in terms of travel time (Box 4). A lower value indicates that people's need for a certain activity (e.g. access to employment, school or hospital) is not met due to long travel times related to poor transport provision. By eliciting users' unmet needs, the indicator also served to identify the transport user groups (that are particularly vulnerable due to limited accessibility to activities. With 62% of retirees assessing their satisfaction negatively, analysis showed that retirees' need to reach health facilities by public transport is largely unmet, while 53% of housewives feel their need to do daily shopping is unsatisfied.