Transport corridors usually offers a variety of modal options with a linear accumulation of infrastructure. The interactions between these modes usually take three forms:
- Modal competition. When one mode is directly competing with another other or with different firms on the same mode, which is often a zero sum game. Competition can take place over cost, time, reliability and niche markets. Each corridor has a passengers and freight balance reflecting their respective competitiveness level.
- Modal complementarity. When two or more modes are exploiting their respective advantages. Corridors represent a setting where integrated transport systems through intermodality are particularly suitable to improve freight mobility.
- Modal shift. When one mode develops better advantages over existing modes and captures a share (or the totality) of the transport demand. Although modal shift usually involved a move towards the atomization of passenger and freight flows (diffusion of automobiles and trucks), the current trend in urban corridors involve their massification, particularly through rail transportation.