When the event happens:
The driver parked the truck.
The truck was parked by the driver.
After it's happened, now that the truck is sitting there:
The truck is parked in the way of the trolleybus.
This is an adjectival passive: the truck is now a parked truck. It is parked somewhere in the street (we couldn't use a 'by'-phrase now).
We can talk about someone's car using the driver's name (or description/profession). If you park somewhere near my house and come inside, you can say, 'I'm parked outside' or 'I'm parked in the next street'. If Copyright's car is behind yours, you can say, 'Copyright is parked behind me.' In the original example, if the driver is still in the cab of his truck, blocking the trolleybus, we can say he's parked there; but we would also say it if he had got out of his cab and gone away. His truck is still blocking the trolleybus so we say he is still parked there.
