M2 Widening Benefits Challenged

John Goldberg, a former principal scientist at the CSIRO and now at University of Sydney has questioned the validity of statistics used to justify the $550M project to widen the M2 through Beecroft and Cheltenham.
Mr Goldberg told the Sydney Morning Herald that he had studied all the traffic densities and the corresponding speeds and concludes that it would be a break-even proposition to get more than 10 km/h increase in average speeds. Transurban have claimed a 40 km/h increase, an estimate that Mr Goldberg says is "wildly out".
He also challenges their estimates for cost-benefit ratios for travel times, accidents, and vehicle operating costs. The company's analysis concluded "the project is economically worthwhile with benefits for the community being estimated to be 3.4 times greater than the costs." Mr Goldberg has reached very different conclusions. He believes the benefits will be only 0.27 times the cost, far below the threshold required for major road projects under the state's environmental laws.
Of course the NSW government and RTA are probably not unduly perturbed about the cost benefit of the project, because Transurban will be funding the work themselves and recovering the cost by increased tolls on road users, a rather neat way of new indirect taxation.
Meanwhile the residents of Beecroft and Cheltenham stand to have two years of massive construction work, and lose much of the delights of the Chilworth Reserve when the present quite tasteful two flyovers are replaced with a ten lane monster highway.