She's Stalled
"… So your brilliant plan is to get out of town?" Dean was not amused. He didn't like running. Worst yet, he didn't like running from something he had no recollection was chasing him in the first place.
"Until we can figure out what is causing you to die more times than every soap star put together, I'd say it would be the safest, most logical plan," Sam insisted. "Look, there's the border."
Just as they approached the 'You are leaving Broward County' sign, the Impala gave a noisy rattle, shuddered and then stopped. "She's stalled," Dean said in disbelief, and then got out to inspect it.
Before Sam could ponder this turn of events, a little green Volkswagen came out of nowhere and rammed right into Dean, leaving a garish red smear on both cars. Sam, stared, horrified, as the teen from the other car got out, face white, phone in hand. "Dean!"