A 3: Parking on someone's driveway counts as trespassing. You can contact the local authority for help. The police can get involved if the driver threatens you. Blocking driveway counts as obstruction and a penalty charge could be issued.
What can you do if someone blocks your driveway?
If someone's car is blocking your driveway, you can report it to the local police, providing details such as the type of violation, street address, and cross street, etc. You can also call 311 to report the vehicle blocking your driveway.
Is blocking an entrance illegal?
No it's not illegal, in accordance with the way you posed your question.
Is blocking someone's car illegal?
Blocking traffic is illegal, creating a traffic hazard is illegal and generally parking outside of designated parking spots is towable. In city parking situations there are usually designated parking enforcement officials who will ticket and/or tow.