This document discusses calculations related to transportation data science project. It includes calculations for traffic flow, generation and attraction rates using different parameters like private vehicle usage and occupancy rates. It also discusses calculations for origin-destination matrices based on generation and attraction rates between cities. Total toll collection amounts are calculated based on traffic flows and toll rates. Maximum hourly traffic flows are estimated based on peak period assumptions. Recommendations for highway lane additions are made based on peak hourly traffic volumes and vehicle carrying capacities.