Well, since we are talking about a common resource and public law that applies to everybody, the subjectivity of value is not really much help. A flat congestio

Well, since we are talking about a common resource and public law that applies to everybody, the subjectivity of value is not really much help. A flat congestion tax is proposed, so I was clearly referring to the monetary value one places on his own time, the amount of money they are willing to give up to reclaim that time. Cost vs. speed is a fundamental trade-off in transportation, nothing groundbreaking here. It allows an economic discussion and market allocation of various individual preferences. Otherwise we are stuck into positions like "my time with my family has infinite subjective value, so I should clearly be allowed to race my Formula 1 car down 5th avenue back from work" - and there is really no way for me to prove that you don't really love your family to that degree. What we can all agree is that time wasted in traffic is net social cost that affects everybody, and that it takes very little extra vehicles on the road to go from peak road efficiency to gridlock. The public resource of road infrastructure is badly mismanaged by leaving it in a a congested, unproductive state.