▁include ▁special ▁features ▁to ▁increase ▁the ▁drama ▁and / or ▁challenge ▁of ▁racing , ▁such ▁as ▁sl ots ▁that ▁w ig gle ▁or ▁s que e ze ▁the ▁lan es ▁together , ▁b umps , ▁air bor ne ▁j umps , ▁or ▁une ven ▁surfaces , ▁but ▁these ▁are ▁typically ▁called ▁" to y " ▁tracks ▁and ▁are ▁not ▁used ▁for ▁competition . ▁ ▁A ▁different ▁segment ▁of ▁the ▁h ob by ▁is ▁slot ▁car ▁drag ▁racing ▁on ▁a ▁long ▁straight ▁strip ▁of ▁track . ▁In ▁HO ▁size , ▁these ▁drag st ri ps ▁are ▁often ▁a ▁scale ▁quarter - mile . ▁▁ 1 : 2 4 ▁Sc ale ▁tracks ▁used ▁for ▁competition ▁are ▁generally ▁ 6 - 8 ▁l ane ▁rout ed ▁tracks ▁with ▁either ▁wooden ▁or ▁flexible ▁pl astic ▁retain ing ▁walls . ▁The ▁tracks ▁are ▁usually ▁located ▁in ▁commercial ▁or ▁purpose - built ▁racing ▁cent res . ▁Most ▁of ▁the ▁tracks ▁used ▁in ▁the ▁US RA ▁regional ▁and ▁national ▁events ▁are ▁either ▁original ▁American ▁Race ways ▁( AM F ) ▁commercial ▁tracks ▁or ▁variations ▁of ▁these ▁designs ▁made ▁from ▁original ▁blue print s . ▁Tra cks ▁used ▁in ▁other ▁countries , ▁including ▁those ▁used ▁for ▁the ▁IS RA ▁World ▁Championships ▁are ▁often ▁more ▁recent ▁designs . ▁ ▁Gener ally ▁tracks ▁used ▁for ▁regional ▁or ▁national ▁competition ▁have ▁an ▁epo xy ▁or ▁polym er ▁painted ▁surface ▁with ▁re cess ed ▁bra ided ▁elect rical ▁contacts . ▁In ▁US RA ▁Division ▁ 1 , ▁the ▁use ▁of ▁tra ction - en han