That "Uber effect" is a circular citation. SFGate is reporting that SFMTA says Uber/Lyft are causing traffic (SFMTA has an agenda), and in their 'report' they c

That "Uber effect" is a circular citation. SFGate is reporting that SFMTA says Uber/Lyft are causing traffic (SFMTA has an agenda), and in their 'report' they cite SF Chronicle (the 'newsier' site of SFGate) as evidence for the claim that Uber and Lyft are to blame: http://www.sfchronicle.com/bayarea/nevius/article/More-ride-options-doesn-t-mean-less-traffic-9139929.php http://www.sfchronicle.com/bayarea/nevius/article/More-ride-... That article provides no evidence to support this claim other than the fact that 37k people have driven for Uber/Lyft/et al in SF. The author then extrapolates that adding 37k drivers to SF is a huge number. As if all those drivers appeared in SF ex nihilo.