A telephone-based stated preference survey was carried out to obtain the data needed. The shippers / transporters questioned had to state the choice of transport mode under basic conditions changed in terms of transport time, transport price and punctuality. They were required to base their response on real life transport cases taken from their own company’s experience. These cases had to involve shipments of at least 5 tonnes transported over a distance of at least 50 km.
The model estimate was developed using the ‘Limdep’ software packet. The model approach was largely based on the multinomial logit model (MNL). Seven separate modal split functions were derived: four for internal traffic and one each for import traffic, export traffic and transit traffic. In all models, the estimated parameters have the right algebraic sign and all are significant to at least the 95% level.