variable tolls

'Congestion pricing' broadly defined is any road use charge or toll adjusted according to the level of congestion.

Level of congestion can be measured either:

- real time as traffic density (dynamic pricing) or

- indirectly by time of day, weekday or weekend, seasons and other rough proxies for congestion

All the dynamic priced facilities are transponder-only. The others mostly have cash tolls as well, and in most cases, but not all, the differentials only apply to electronic tolls, that is those using a transponder.

Here is v3 of our list:

IBM is working to get agreement internally on a formal statement on a controversial "Variable rate toll system" patent that the company gained from the US Patent Office January 22. An official says that getting the patent was not part of any corporate strategy to "corner the market" on road pricing as others are alleging.

MARYLAND ICC

First Dynamically Priced Pike Pushed