Hello I am a solicitor with over 15 yeas experience. I will try to help you with this.
I am afraid that there is probably not much you can do about this. If they are not coming on to your property but merely temporarily blocking the access to your property and are not parking on yellow lines etc then yo will have no rights that you can enforce at all.
so does your position on my issue stay the same if the vehicles are part parking on the road and path such that it is over my drive on the dropped curb...are they not technically on my property/
Yes it does, no they are not unless you actually own the pavement with the drop curve.