Abstract
Keywords: commercial speed, average commercial speed, road traffic, public transport system, wheel tramway.
In the first part of this paper it is defined the general concept of commercial speed, respective the average commercial speed, as a parameter of technical and economical analyze for a certain itinerary, within a public transport system by regulated duty. In the second part of the paper it is deployed a calculation model that emphasizes the interdependence between the values of this parameter and the particularities of road traffic within the analyzed itinerary. The calculation model was applied by authors to make the opportunity study for introducing a new public transport system on individual lane (wheel tramway) within the metropolitan area of Pitesti city..