▁goal ▁being ▁to ▁establish ▁a ▁North ▁American ▁" true ▁scale " ▁ 1 : 2 4 ▁and ▁ 1 : 3 2 ▁North ▁American ▁racing ▁series . ▁The ▁T SR F ▁concept ▁is ▁very ▁similar ▁to ▁full - scale ▁" spec " ▁racing ▁where ▁only ▁T SR F ▁approved ▁equipment ▁can ▁be ▁used ▁for ▁competition . ▁Many ▁other ▁countries ▁have ▁national ▁organis ations , ▁for ▁example ▁the ▁British ▁S lot ▁Car ▁Racing ▁Association ▁( B SC RA ) ▁have ▁been ▁running ▁national ▁champion ships ▁since ▁ 1 9 6 4 . ▁ ▁HO ▁Organ izations ▁There ▁are ▁two ▁large ▁HO ▁racing ▁organizations ▁in ▁the ▁US : ▁H OP RA ▁( the ▁HO ▁Professional ▁Racing ▁Association ) ▁and ▁U F H OR A ▁( the ▁United ▁Federation ▁of ▁HO ▁R ac ers ▁Association ). ▁Each ▁hosts ▁a ▁national ▁competition ▁ann ually , ▁usually ▁in ▁July . ▁There ▁are ▁many ▁state wide ▁organizations ▁running ▁under ▁H OP RA ▁and / or ▁U F H OR A ▁rule ▁sets . ▁ ▁" The ▁F ray ▁In ▁Fer nd ale " ▁bo asts ▁the ▁largest ▁turn out ▁of ▁any ▁slot ▁car ▁race ▁in ▁the ▁world . ▁The ▁highly ▁compet itive ▁race ▁is ▁held ▁year ly , ▁in ▁March , ▁and ▁more ▁than ▁ 1 0 0 ▁individuals ▁and ▁ 1 6 ▁teams , ▁show ▁up ▁to ▁race ▁on ▁ 8 ▁tables . ▁This ▁is ▁the ▁race ▁that ▁determ ines ▁the ▁direction ▁that ▁the ▁h ob by ▁takes . ▁The ▁race ▁has ▁been ▁held ▁since ▁ 1 9