Court costs if you lose

I recently got a ticket for $150 for driving in a bus lane (outside Wellington hospital going towards the city). I explained in my appeal that I was coming out of the cancer society car park and had to travel in the bus lane for a little bit till some kind person let me move out of the bus lane and into the main traffic lane. Their reply said that I took more than the allowed 50 metres so I had to pay the fine. I think that it's ridiculous and want to take it to court to get it decided. My question is, if I lose in court will I be up for court fees or any other fees in addition to the fine of course.