The graph below indicates what happens to the number of cars that pass a point on a single lane highway per hour (volume) as the number of cars per kilometre (densiw) increases. Assume that: - the highway has a speed limit of 100 kilometres per hour; - the carrying capacity (maximum volume) is 5000 cars per hour; ' on average, cars move at the speed limit until carrying capacity has been reached but must move more slowly at higher capacity; 0 cars are 4 metres long; and - at carrying capacity the average distance between cars is four car lengths. Note: In this unit, answer all questions according to the information provided. Volume (cars per hour) Vehicle density (cars per kilometre) 3 Consider situations where vehicle density is I 25 cars per kilometre; and II 75 cars per kilometre. A volume of 2500 cars per hour could occur in A situation I but not situation II. B situation II but not situation I. C both situation I and situation II. D neither situation I nor situation