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psychojoe said..
Could put a bright light on. They don't like it so they'll go somewhere else.
They are pretty clever. I remember one came up to us at a group dinner at a holiday house, during the evening, perfectly tame, knowing that people would feed it. I agree, that they don't like bright light, but this one seemed to figure it also meant food.
I had them at my house for years, and then got a dog, so the dog would run around the tree barking its head off, and the possums just ignored it.
They are territorial, and if there is not one in your territory, there soon will be. They are smart too, as I had one figure out that it could lift up a roof tile, and then found itself a great place to burrow in amongst the insulation in my roof. The trouble with that is that they know the smell of the place and will go to great pains to get back there, so you may as well make it difficult for them and offer them somewhere else to sleep. If you don't give them somewhere else to nest, they will just get back into your roof if there are any options.
My last house had possum boxes in the trees everywhere. Better than having them in the roofspace.