What I did:
enter car. Sleep. wake. read skill book. change speed to highest. Zombies come towards the car. Speed goes back to normal speed. Zombies bashing on car. Unable to stop reading book, drop book, or leave car. Zombies break window and munch.
tried:
E to leave. Radial menu to leave. Radial menu to change seats. Radial menu to unlock doors. Book is still caught in reading mode.
Thanks and good luck guys.