Design a Public Transportation System

Functional Requirements:

• Route Planning: Allow users to plan trips using public transportation (bus, tram, subway) between two locations.
• Schedule Information: Provide up-to-date schedules for all routes and stops.
• Real-time Vehicle Tracking: Show real-time locations and statuses of vehicles.
• Fare Calculation and Payment: Enable users to view fares and pay for trips digitally.
• Notifications: Notify users about delays, disruptions, or changes in service.
• Multi-modal Support: Support journeys involving transfers between different transportation modes.
• Accessibility: Ensure the system is usable by people with disabilities (e.g., screen reader support).

Non-Functional Requirements:

• Scalability: System should handle thousands of users and real-time data updates, especially during peak hours.
• Reliability: High availability, with minimal downtime and robust error handling.
• Performance: Fast response times for user queries and real-time updates.
• Security: Protect user data and payment information; ensure secure transactions.
• Usability: Intuitive interfaces for web and mobile users.
• Maintainability: Modular design to allow easy updates and bug fixes.