"...at a rate constantly updated to keep traffic moving."

Playing into Planners' Hands

The idea behind congestion pricing is that you charge for the use of the road, at a rate constantly updated to keep traffic moving. No congestion = no toll; high congestion = high tolls. Those people willing to pay for the privilege of using the road under free-flow conditions during peak demand will get to use it, while those unwilling will take other routes, find other modes (the bus, carpools), or commute at other times.

Murph has put his finger on one of the practical problems (besides privacy of course, for which there is always offered yet another technological fix): a congestion pricing system must be dynamically priced to adjust to changing demands.

"...at a rate constantly updated to keep traffic moving."

To my understanding, NO congestion pricing proposal even remotely contemplates such a structure. The mechanics are daunting. In fact the politics are daunting, too. Moreover so much of what we perceive as congestion is caused by "breakdowns" and beyond the reach of pricing. Better to have a fleet of helicopters standing by to lift broken vehicles out of the way.