Stealth knows morse code, The Driver doesn’t

“I believe your car is attempting to communicate in Morse code.”
“What?”
She gestured at the shrub. The headlights blinked in a series of long and short flashes. George watched for a moment before he saw the pattern.
“Is that an SOS?”
“The pattern it is repeating is OSO,” said Karen, “which is why I said ‘attempting.’ It is a common mistake for those who do not know Morse code.”
The engine growled and the pattern of flashes changed. The radio switched on and shouted some talk radio at them. Outside the car, with the engine running, it was just distorted squawks.

Excerpt From Ex-Purgatory, pg 303
Peter Clines
https://books.apple.com/us/book/ex-purgatory/id676938479