A. The sampling
A proportional stratified sampling with a 95% confidence
interval and a 7.5% level of significance has been used
[6]. At first a complete list of Fano companies has been
gathered from Ancona chamber of commerce. Only the
most important sectors and compagnies concerning the
freight traffic creation has been considered for the
questionnaire. Companies with less than 3 employers and
retailers has been excluded. The considered sectors has
been: farming, fishing, mineral processing,
manufacturing, wholesale trade and road haulage.