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>> i honestly believe if i didn't have those skills, he would have driven me into a tree, flipped me over. i have no doubt that he would seriously have assaulted me. >> olson says he still doesn't know what sparked sullivan's rage. >> i know for a fact nothing happened on the road because i didn't even know this vehicle was behind me. no idea what caused this. >> he's just relieved the terrifying incident is over. >> this is shaking me. how do you deal with somebody trying to, what i think, you know, kill you on the road? you better get someone here. this dude is crazy. here he -- oh. >> can y...

>> august 19th, 2012. lauri ulvestad is driving home from missouri to iowa when her ride takes an alarming turn. >> 911, where's your emergency? >> i'm on 35 northbound. i'm at mile marker 86. and my car is just picking up speed. >> okay. are you able to hit your brakes at all? >> i've tried everything. >> kelly bride has been working as a 911 dispatcher in harrison county for only three months when she picks up the frantic call. >> the first training module i ever did was a stuck accelerator. and it went through the steps to tell the caller what to do. >> all of a sudden it just started picki...

Seriously have assaulted me. >> olson says he still doesn't know what sparked sullivan's rage. >> i know for a fact nothing happened on the road because i didn't even know this vehicle was behind me. no idea what caused this. >> he's just relieved the terrifying incident is over. >> this is shaking me. how do you deal with somebody trying to, what i think, you know, kill you on the road? you better get someone here. this dude is crazy. here he -- oh. >> can you stop the car? >> no. he's jumping on my hood. smashed my windscreen. coming up -- a fun day of sledding takes a horrifying turn. >> ...

Him escape the attack. >> i honestly believe if i didn't have those skills, he would have driven me into a tree, flipped me over. i have no doubt that he would seriously have assaulted me. >> olson says he still doesn't know what sparked sullivan's rage. >> i know for a fact nothing happened on the road because i didn't even know this vehicle was behind me. no idea what caused this. >> he's just relieved the terrifying incident is over. >> this is shaking me. how do you deal with somebody trying to, what i think, you know, kill you on the road? you better get someone here. this dude is crazy. ...

Him escape the attack. >> i honestly believe if i didn't have those skills, he would have driven me into a tree, flipped me over. i have no doubt that he would seriously have assaulted me. >> olson says he still doesn't know what sparked sullivan's rage. >> i know for a fact nothing happened on the road because i didn't even know this vehicle was behind me. no idea what caused this. >> he's just relieved the terrifying incident is over. >> this is shaking me. how do you deal with somebody trying to, what i think, you know, kill you on the road? you better get someone here. this dude is crazy. ...