▁( C rown ▁Victor ias , ▁Imp al as , ▁and ▁Ch arg ers , ▁Ford ▁Police ▁Inter ceptor ) ▁as ▁well ▁as ▁un mark ed ▁units ▁of ▁vehicles ▁r anging ▁from ▁Crown ▁Victor ias ▁to ▁Grand ▁Prix ▁G TP s ▁to ▁L S - 1 ▁power ed ▁Z 2 8 s ▁to ▁Must ang ▁GT s . ▁ ▁The ▁Must angs , ▁Cam ar os , ▁and ▁other ▁vehicles ▁are ▁for ▁a ▁program ▁created ▁to ▁combat ▁ag gress ive ▁driving ▁and ▁speed ing . ▁Light bars ▁used ▁on ▁marked ▁units ▁are ▁Code ▁ 3 ▁X 2 1 0 0 ▁LED ▁units , ▁Federal ▁Sign al ▁Leg end ▁units ▁and ▁Code ▁ 3 ▁M X 7 0 0 0 ▁hal ogen / st ro be ▁units . ▁ ▁Prior ▁to ▁that , ▁it ▁was ▁a ▁mixture ▁of ▁the ▁Code ▁ 3 ▁M X 7 0 0 0 s ▁and ▁Federal ▁Sign al ▁Jet S on ics ▁and ▁Federal ▁Sign al ▁V istas . ▁ ▁Since ▁ 1 9 8 6 , ▁the ▁Illinois ▁State ▁Police ▁has ▁pat rolled ▁Chicago ▁express ways ▁( D istrict s ▁ 3 ▁and ▁ 4 , ▁which ▁merged ▁to ▁become ▁District ▁Chicago ). ▁ ▁Since ▁ 2 0 0 6 , ▁photo ▁rad ar ▁mounted ▁in ▁v ans ▁have ▁been ▁used ▁for ▁speed ▁enfor cement ▁in ▁construction ▁zones ▁state wide . ▁Though ▁the ▁v ans ▁are ▁man ned ▁by ▁State ▁Police ▁tro op ers , ▁a ▁private ▁company , ▁A CS ▁State ▁and ▁Local ▁Sol utions , ▁provides