Around 1600hrs A-159 was dispatched to the intersection of Darby Rd and Stretch Ct for a reported injured person, the ambulance was in Station 25's area B-156 marked up as a 1st responder, ECC quickly advised it was now a ATV crash and added additional equipment bringing RE-153 ET-154 AND M-17, B-156 arrived and advised he had 1 subject down in the street, the brush truck began pt care of a adult male with a severe leg injury, A-159 and M-17 arrived and the helicopter was requested, RE-153 set up the LZ for TROOPER-3 and the pt was flown Pri-2 to BALTIMORE SHOCK TRAUMA