Why, you may ask. Well, consider these points:
The traffic along the coast road becomes just one long queue in the summer months.
The road is very narrow and winding, two buses cannot pass easily.
Overtaking is generally impossible.
If two coaches or buses or trucks meet then one must reverse.
You can easily damage your rental car and or the wing mirrors.
Parking charges are in the region of 25 to 30 Euro per night.
On-street parking is between 2 and 3 Euro per hour.
So, leave the car at home and let the bus or ferry boat take the strain!!!