No, you are not allowed to drive a car on the hard shoulder if the edge line is solid. It is, however, permitted to do the following:

• Walk and cycle (not permitted on motorways or clearways).
• Drive a moped class 1 and 2 (not permitted on motorways or clearways).
• Drive a tractor or motorised equipment (not permitted on motorways or clearways).
• Drive a vehicle that is not allowed to go faster than 40 km/h (not permitted on motorways or clearways).
• Drive a vehicle designed for a maximum speed of 40 km/h (not permitted on motorways or clearways).
• Tow another vehicle (only to the first suitable exit on motorways or clearways).
• Stop in the event of an emergency.

It is also permitted to cross a solid line or an obstruction marking – with great care – in the following cases:

1. If you are forced to make an emergency stop.
2. In order to pass an obstacle on the road.
3. If there is otherwise not enough space in a junction for your vehicle.
4. If it is needed to get to or from a property or equivalent.

Read more about the hard shoulder