The Transurban/RTA's ''road user cost-benefit analysis'' estimated widening the M2 would increase average vehicle speed by 40 km/h in typical stop-start conditions.
But Dr John Goldberg - a former principal scientist with the CSIRO's National Measurement Laboratory, now at the University of Sydney - recently tabled an analysis (which has been peer-reviewed) that disagrees. John predicts that widening the tollway from four lanes to six gives only a 50 per cent chance of the average traffic speed increasing by more than 10 km/h.
A spokesman for Transurban responded that the reference to 40 km/h in the company's analysis was a ''standard speed, used for all road projects assessed in NSW''. Doesn't sound like rigorous scientific methodology!
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