When you are driving on an expressway you must remember that the greatest danger on expressways is?

In driving in an expressway, the driver should always keep in mind and remember that the greatest danger on expressways are fast cars. It is because there are drivers who are really fast and does not maintain the right and standard meter in which is usually the cause of accidents. It is best the drivers should always watch out for cars and maintain their eyes on the road and in their mirrors, as well as using safe driving, in order to prevent accidents from happening.