Today public transport in urban areas is entrusted primarily to buses and to a lesser extent in tramways or mixed systems (trolley buses). These traditional technologies, have deteriorated since are carried out using the same paths of private vehicles. So during peak hours the conditions and quality of service will expire and increase travel times (average journey speed of urban transport in big cities do not exceed 12 Km/h). Public transport is less and less used, increasing the use of private vehicles and thus increases traffic congestion.
In urban public circulation is sometimes entrusted to “bus lanes”. This solution is often not viable for lack of suitable areas, because urban areas have been built in times when mobility parameters were significantly different. For this reason the surface public transport on own seat often are difficult to be implemented, except to have roads wide and adequate to support such a solution. Therefore it only remains to assess the roadway above and below the roadway, in this case, because spaces are definitely restricted, we must also adopt the Guide. Among the main transport systems on own seat and constrained guide there are carriage on steel rail (railways, subways, trams) and monorail transport. Aside from rail transport widely treated, we explore instead the monorail transportation, formerly poorly known but that is beginning to impose itself as an innovative and inexpensive compared to other NATO-bound transport systems. The monorails are a mix between road transport and transport on rail tracks. The main difference compared to transport railroad track lies in the presence of one (instead of two) of considerable width, built in concrete and in some cases even steel. Powered by wheels in rubber instead of steel wheels. This solution represents a good compromise, guaranteeing excellent performance, low energy consumption, reduced installation costs and managing to overcome steep slopes. The main feature lies in the simplicity of infrastructure installation is faster and easier than an underground railway line. This solution does not penalize the ability to “load” in order to significantly reduce road congestion and consequently environmental pollution.