Transport may be divided into three essential types. They are: passenger transport, commodity or cargo transport and information exchange.
The most important motorway in the United Kingdom is M25. This is laid around the city of London. With this, the centre of London which has heavy traffic all the time is avoided. It is estimated that travel time decreases by about 60 per cent for certain vital locations in London, primarily due to M25. This route connects the three important airports in the United Kingdom (Heathrow, Gadwick and Standstead). Likewise, there are several expressways connecting the European countries. Particularly, along the border between Italy and France, a tunnel for 15 km has been made to facilitate road transport.
The recent development in the rail traffic is the opening of the 'sea tunnel ways'. The best example is the one between London and Paris beneath the English Channel, running for 40 km. This tunnel way, in fact, functions in three tunnels and not just one. In one, the trains are run at 300 km/hour while in the second there is the transport of vehicles crossing the channel. The third is the service tunnel for both. This rail transport began in 1994. This 'beneath the sea rail transport' is also an example of human ingenuity and technology. In the cities and mega cities, the railways offer yeomen services to the people. Metro rail transports are either trams services or electrical locomotive units. Trams are still in vogue in Kolkata. They are operating in cities like Toronto of Canada, too. They supplement the road transport. In most cities of India, the suburban railways connect the city centres with the suburban areas. In Chennai alone, the suburban trains carry as many as 2 million passengers a day. It is estimated that in a few years it would touch 3 million.
The airline traffic connects areas inaccessible to land (road and rail) transport. Aircrafts help in reaching such areas as the Amazon forests and the distant islands of Andamans and Nicobar. The very heavy air traffic in the world is that between the city of New York and Los Angeles. There is also heavy passenger traffic in the route of New York London Paris. In the same way, there is heavy passenger traffic between India and the Gulf countries, Singapore and Malaysia.
In recent times, there has been a change in the way people travel by air, with the introduction of cheap air travel. While there has been a competition among the international airlines, it has also resulted in prices being cut drastically by some airlines to improve their performance. Some new airlines have sprung up offering 'rock bottom' prices for air travel, while slashing down on services, which now need to be bought. The new, cheap airlines do not for example hospitality services as part of the ticket fare but rather demand such services be paid for by the passengers making the travel by airlines.
The ships involved in sea traffic have their importance determined by their volume and the structures. They are in effect floating hotels. There are swimming pools, dance halls and special rooms with high amenities and services. While there are ships that could carry as many as 2,000 passengers, there are also ferries and boats/yachts which could carry only a few passengers. Ships that travel at a speed of 50 km/hour to 100 km/hour are in use. As of today, most sea travel is for recreation and tourism. In North America and the island rich European continent, sea travel accounts still for large bulk of the passenger traffic. Otherwise, only the freight traffic and the cargo carriers are the most important of the sea traffic.