Once a thorough diagnosis of the transportation system has been conducted, a range of potential solutions to address the identified problems is identified. These solutions may include low-cost, high-impact measures that can be implemented quickly, or they may require significant investments in both infrastructure and the various components of the transportation system, such as the vehicle fleet, management systems, and collection and payment systems.

Regardless of the nature of the proposed solutions, pre-investment studies are essential to determine the project's feasibility and financial viability. These studies involve a comprehensive set of financial and economic evaluations that assess the costs, benefits, and risks associated with the proposed investment.

The project sizing phase of pre-investment studies encompasses the following key elements:

• Problem Identification: Clearly defining the transportation problem that the project aims to address.
• Solution Alternatives: Developing a range of potential solutions to address the identified problem.
• Conceptual Design: Creating a conceptual outline of the chosen solution, including its design principles and overall functionality.
• Functional Design: Detailing the specific functions and operations of the chosen solution.
• Operational Design: Outlining the operational procedures and management practices for the chosen solution.
• Component Sizing: Determining the appropriate size and capacity of each component of the project to ensure integrated mobility.

The insights gained from pre-investment studies are invaluable for transportation planners, enabling them to make informed decisions about project selection, resource allocation, and investment strategies. By carefully considering the financial, economic, and technical aspects of a proposed project, pre-investment studies help to ensure that transportation investments are made wisely, effectively, and with the long-term interests of the community in mind.