Which of the following factor influences the demand for transport ?

The correct answer is Option 2: Size of population

Option 2: Size of population : This statement is correct. Demand for transport is influenced by the size of population. The larger the population size, the greater is the demand for transport.

Other Options:

Option 1: Length of route : This statement is incorrect because length of route affects transport cost and time, but it is not the main factor determining demand for transport.

Option 3: Location of cities : This statement is incorrect because location may influence transport patterns, but the primary factor affecting demand is the number of people and economic activities.

Option 4: Type of climate : This statement is incorrect because climate may affect transport operations, but it does not directly determine transport demand.