That's the cost of the emissions. What about the inefficient use of road space that comes from having highways full of single-occupant vehicles at rush hour, th

That's the cost of the emissions. What about the inefficient use of road space that comes from having highways full of single-occupant vehicles at rush hour, the larger roads required by said inefficiencies per given unit throughput as compared to buses or rail, and the opportunity costs of the land for the bigger roads or the money to build them?