Broken Radial Head - When is it safe to drive?

I broke my radial head on Aug 5th. I have had sling and pain meds treatment. It is definatley not as painful - I have not needed any pain meds for 2 days. It gets a bit achy, but nothing terrible.
When it will be safe for me to drive again? I really need to drive somewhere on Monday, but my family is leary of me doing so quite yet. I do not have full mobility - I can stretch it out about 80% straight out and can turn my wrist now, although a bit stiff.
Anyone have any input?