Radar control in front of a speed sign

Can anyone help me? I moved to Frankfurt three months ago to see my friend before in Aschaffenburg. Now I was plitzed in Bornheim. Live here in Nied and only travel with Navi because I don’t know myself, I am self-employed and have customers everywhere. Yesterday I went to one to Bornheim, and drove down a small mountain on the right side I had to park there left was no parking. So I turned in a garden and parked there, about five to four Six meters behind me is a traffic light system, the cars got closer and I didn’t want to wait again until everything is over. So I gave gas so I could get out quickly because these cars were very fast. Zack… plowed I looked to the left a 30 he sign, because I didn’t get the road from below I didn’t know that there were 30 km there, and the speed camera was standing directly one to two meters before the 30 he sign. Do I still have to pay the penalty?????