Which of the following best describes mode split in travel demand modeling?

Mode split in travel demand modeling refers to the distribution of trips among different transport modes, such as private vehicles, public transit, cycling, and walking. Understanding mode split is essential for planners because it helps in analyzing how people choose to travel based on various factors, including accessibility, travel time, costs, and preferences.

Analyzing mode split allows planners to assess the effectiveness of transport policies, develop strategies to promote sustainable transport options, and improve the overall efficiency of the transportation system. By evaluating the proportion of trips taken by each mode, planners can make informed decisions to enhance infrastructure, allocate resources, and encourage shifts toward more efficient or environmentally friendly modes of travel.

The other options, while relevant to transport planning, do not specifically describe mode split. For example, total demand for public transport services focuses solely on public transit, while the efficiency of roadways pertains to the performance of highway systems. The analysis of trip destinations involves understanding where trips are going rather than how they are made. Thus, option A accurately captures the essence of mode split in travel demand modeling.