I also heard there are speed camera's in the tunnel. So I guess there's no chance of giving the Zed a blast!! There are plenty of other great tunnels in Europe. Talking of Slovenia, I believe if I remember rightly, I was travelling from Austria to Triest in Italy. Whilst heading through Slovenia there was a wicked tunnel. Nice and long, no camera's and nice and clean. Shame I was in a B class Merc at the time!!
Talking of speed camera's I remember driving a high top luton van across Europe, was in Germany heading down this hill and there were speed camera's on the gantry, heading down the hill. There were specific lanes for vehicles and each lane had a specific speed limit. I accidently overtook a large truck and headed down the middle lane. SNAP!! That was my photo taken - apparently vehicles of size were not allowed to overtake and I had my picture taken. The strange thing was that my picture was taken in my face/eyes!! Surely these should be illegal. I remember blue and purple spots appearing in my vision. Got home, returned the hire vehicle and never heard anything from the German authorities?! Bizzare!
Enjoy your trip sprevett!