[sgbuffett]

They may only need it once a week or a month. What to do with the car for the rest of the days? Isn't rental car better?

Such half cooked ideas would only give rise to more problems than solving thems

That is part of the assessment of person's need. If occasionally need then should not be allocated.

But some need to ferry elderly parents on a daily basis to day care.

Even you disagree with me ...you mean there is no better idea than current COE system and the system cannot be improved?