▁f ren z ied ▁and ▁ag gress ive , ▁sim ulating ▁race ▁conditions . ▁Pre viously ▁teams ▁would ▁util ize ▁week days , ▁and ▁very ▁often , ▁lo os ely ▁util ize ▁the ▁down ▁times ▁of ▁the ▁final ▁day ▁of ▁time ▁tri als ▁for ▁such ▁practice . ▁Due ▁to ▁the ▁format ▁changes ▁of ▁time ▁tri als , ▁ade qu ate ▁time ▁is ▁no ▁longer ▁available ▁to ▁practice ▁during ▁down ▁times ▁on ▁the ▁last ▁day ▁of ▁time ▁tri als ▁due ▁to ▁the ▁length y ▁post - qual ifying ▁technical ▁ins pection , ▁and ▁the ▁general ▁laten ess ▁of ▁the ▁day ▁that ▁the ▁starting ▁grid ▁is ▁final ized . ▁This ▁extra ▁practice ▁period ▁is ▁also ▁sometimes ▁used ▁by ▁teams ▁to ▁reach ▁maximum ▁mile age ▁for ▁engines , ▁as ▁they ▁install ▁a ▁fresh ▁engine ▁for ▁Car b ▁Day ▁and ▁race ▁day . ▁Under ▁current ▁IN D Y C AR ▁rules , ▁an ▁engine ▁must ▁reach ▁ 2 , 5 5 0 ▁miles ▁( or ▁ 4 , 1 0 0   km ) ▁during ▁the ▁season ▁in ▁order ▁to ▁be ▁el ig ible ▁for ▁a ▁fresh ▁engine . ▁Ind y ▁L ights : ▁The ▁Ind y ▁L ights ▁series ▁began ▁holding ▁a ▁support ▁race , ▁the ▁Fre edom ▁ 1 0 0 , ▁during ▁the ▁month ▁of ▁May ▁in ▁ 2 0 0 3 . ▁For ▁the ▁first ▁two ▁years , ▁it ▁was ▁held ▁on ▁the ▁second ▁week end ▁of ▁time ▁tri als . ▁In ▁ 2 0 0 5 , ▁it ▁was ▁moved ▁to ▁Car