With such information (given the lack of other usual information sources) the panel used this data to rank important health risks. Such identification and description of the type and size of health impacts (both positive and negative)is typical of the appraisal stage of HIA. The largest risk by far was that posed by HIV. Focusing on how different groups of people and communities were affected by the proposal was carried out. For example, truck drivers would transport pipeline products from a port in Cameroon(where HIV infection rates are high) over 1000km into the interior of Southern Chad(where infection rates are far lower). The role of long-distance truck drivers is important in the spread of HIV in Africa and this was addressed in recommendations.