The latest from DfT seems to be that the minister has decided to wait to see what the effect of “free-flow tolling” is before any decision is taken on any additional Thames Crossing. Free-flow charging is due to begin in October 2014. Note that as a precursor to free-flow tolling additional gantries have been erected over the M25, with additional speed cameras and these have now been switched on. How long it will take to measure the effect of free-flow tolling is anyone’s guess but one can imagine it will be well into the next government, and it is additionally imaginable that there may be some tinkering with exactly how free-flow tolling is set up. There were rumours of a 20mph speed limit which sounds more like a choke-flow tolling….