▁the ▁term ▁" Double ▁D ut y " ▁in ▁context ▁to ▁mot ors ports . ▁Nam ely ▁instances ▁where ▁a ▁driver ▁compet es ▁in ▁two ▁major ▁races ▁on ▁the ▁same ▁day ▁or ▁on ▁success ive ▁days . ▁This ▁occurs ▁in ▁a ▁fairly ▁regular ▁fashion ▁in ▁NAS C AR , ▁where ▁a ▁driver ▁( o ften ▁numerous ▁drivers ) ▁comp ete ▁in ▁the ▁X fin ity ▁Series ▁and ▁Cup ▁Series ▁events , ▁or ▁even ▁G ander ▁Out do ors ▁T ruck ▁Series ▁races ; ▁this ▁practice ▁is ▁widely ▁known ▁as ▁" Bus ch wh ack ing " ▁( in ▁reference ▁to ▁the ▁X fin ity ▁Series ' ▁then - title ▁spons or ▁Bus ch ▁be er ). ▁However , ▁in ▁most ▁cases , ▁the ▁multiple ▁events ▁take ▁place ▁at ▁the ▁same ▁ven ue , ▁dimin ishing ▁the ▁complexity ▁of ▁the ▁fe at . ▁At ▁times , ▁some ▁drivers ▁even ▁rac ed ▁the ▁entire ▁NAS C AR ▁Cup ▁and ▁entire ▁X fin ity ▁schedule , ▁which ▁included ▁some ▁travel ▁between ▁cities ▁for ▁a ▁hand ful ▁of ▁week ends ▁where ▁the ▁two ▁series ▁were ▁at ▁different ▁ven ues . ▁ ▁On ▁rare ▁occasions , ▁there ▁have ▁been ▁situations ▁in ▁which ▁an ▁X fin ity ▁Series ▁race ▁became ▁ra ined ▁out , ▁and ▁was ▁res ch eduled ▁for ▁the ▁day ▁of ▁the ▁NAS C AR ▁Cup ▁race . ▁This ▁occurred ▁the ▁week end ▁of ▁the ▁ 2 0 0 7 ▁W inn - D ix ie ▁ 2 5 0 ▁and ▁Pe psi ▁ 4 0 0