Nowadays, if you want to cover long distances with a car, you have to use the motorway. They have a lot of advantages, but at the same time, they cause many problems, too. Sometimes, while you are driving on this huge road, you could meet too many vehicles, nevertheless you can travel quickly. Although, the probability of an accident soars, thus, a possible solution of this it's building others motorways, so as to divide the traffic between two tracks and consequently causing fewer problems...