Crystal ball forecasting

60,000 new jobs from the new transport plans in and around Bristol?? Story here. This will sound like a gross exaggeration to many people. On what basis have they made this claim exactly? Crystal ball gazing? This is an argument technique many use to try to justify schemes, such as new roads, that many local people have concerns about. Chief executive of Bristol Airport and transport lead for the Local Enterprise Partnership Robert Sinclair say they believe this is the figure but of course they have an interest in talking up developments they favour - and the only people backing them up in the report are business and political figures who have the same interest, so they add no weight to the claim at all. So, all we are left with is a jobs figure a few say they believe in and no substance.