Remember a Danger Area and a Restricted Area are quite different beasts.
In the main a Restricted Area is to protect something on the ground from objects in the air. You should ensure that should you have an engine failure you can still remain clear of the restricted area. If you enter it at any time you can be prosecuted.
You are not restricted from entering a Danger Area, but it would be unwise to do so. The operator of a Danger Area is obliged to check that the area is clear before engaging in the dangerous activity. If you enter, you could be prosecuted for endangerment under certain circumstances.