Private car travel currently incurs 0.16$ per vehicle-kilometer in private costs & 0.55$ per vehicle-kilometer in social costs. Scaled globally, these unit costs translate to roughly 2.1$ trillion in private and 7.2$ trillion in social costs per year 77% of the cost is currently externalized (‼️) https://www.sciencedirect.com/science/article/pii/S0965856426003769