I'm always surprised when I read about being able to drive when one is taking medication for PD.
There is a guide for GP's and Neurologists called the,
"At a glance guide to the current medical standards of fitness to drive".
You can download it in pdf format, http://www.dft.gov.uk/dvla/medical/ataglance.aspx
Personally, I think that a lot of people under medication should take seriously the implications as to what it say about Parkinson's.
CHRONIC NEUROLOGICAL DISORDERS
e.g. Parkinson’s disease,
Licence refused or revoked if condition is progressive or disabling. If driving would not be impaired and condition stable, can be considered for licensing subject to satisfactory reports and annual review (individual basis).
I have attended many meetings for people with PD and and have seen them nod off during the conference but then go home in a car.
Sorry to put a damper on things, but maybe we should be more honest with ourselves and admit; no matter how tragic it may seem that there will come a time if not now, that we should not be allowed for our safety and the safety of others to drive.
It's one thing to get past a quick test,and be happy that they have renewed your licence, but if we knock down a child ?
Many of the medication taken for PD and for depression would not fit into the criteria of being allowed a licence to drive.
When you get behind the wheel you have a moral obligation, no matter how much it may hurt you psychologically to give up those four wheels bet to be safe than sorry.
PS. Not to mention those that use Citalopram ,Cipralex, escitalopram and Diazepam.
Perhaps we should think twice and not be so egoistic to want at all costs four wheels.
PPS> I bet I can await a loud uproar now!