AFAIK it's the bridge under Main Road, just before the Nicol offramp on the N1. I recognise the Samsung billboard.
Sorry to bring up an old thread, but I had to for this.
They have painted out all the asshole signs, but on my way to work this morning, I was driving on the N1 North, under Grosvenor rd, and there was a traffic cop sitting there trapping, and above his head, where they had painted out the asshole, someone's written "Still a asshole", with the arrows like the old sign.
Damn but I laughed.
I know many traffers can be assholes, but they are also just doing their jobs. Fact remains we shouldn't be worried if we are not speeding...