No such data yet; but (1) the effect of a 1-3% recession on (road) traffic would be a magnitude less even in Western countries, (2) here, such an effect would be opposed anyway by the on-going expansion of highways, avoiding routes and ex-urban malls (gah...); (3) The economy of Hungary is on a different curve than most of the rest of the EU: GDP growth fell to a (by regional standards) snail-pace 1.1% already in 2007, then stayed around that level (with a relatively minor effect of the crisis until Q3/2008 even in seasonally adjusted quarter-on-quarter data [last row in linked table], compare Germany [last column in that table]).

_{*Lunatic*, n.
One whose delusions are out of fashion.}