If you think a study is biased, and you have proof, that's fantastic! Please come forward with it. However, its almost always the case, even right here on UT, that when people are claiming studies are biased, they have absolutely zero backing for their claims. It's just a hunch in their mind, And the "logic" of this hunch comes down to "I don't agree with the results, therefore the study is biased". This does not lend itself to productive discussion.
If you think a study is biased and if you have proof of it, please come forward with it. Transportation planning in Toronto is wonderful in that all of our major transpiration initiatives have hundreds, if not thousands of pages of supporting documents. If Staff have been cooking the books, go through the documents and point out the flaws to us. The studies and reports are written in plain English, and anyone frequenting the Transportation & Infrastructure forum should easily be able to understand them if they care. Some people, such as Steve Munro, have even made a career (or extreme hobby) of exposing the flaws of these reports.
That said, personally, I've found that when I've had doubts about the validity of a report, those concerns are typically resolved once I take the time to property understand the reports. For example, I was initially very critical of the decision not to grade separate any of Crosstown West crossings, but once I carefully went through the Environmental Assessment, not only were my concerns of bias erased, but I even came to agree that the lack of grade separations was the best option from a cost/benefit standpoint.
I'll close by saying that just because you and the report have an interpretive disagreement (that is, a disagreement on what is the best method of solving a problem), it does not mean the report was necessarily biased. Planning is a very subjective thing, and it is totally possible for two groups to come come up with two different, but completely valid solutions on how to solve an issue.