2. Transportation: in Hameln most of people using Cars to drive from small town like klein berkel or Aerzen to drive Hamlen. But whenever people travel through the Bus or Train to Hameln (e.g. Klein berkel or großberkel ). So they travelled by public transport (battery or hydrogen Bus of city) about 20 minutes from place A to B. So they got carbon credits of 20 minutes; these 20 minutes can be used by city resident to access city bicycle (city bicycle means provided by Bicycle and bicycle by city Govern. At different places of city with parking places like. Frelo bicyle in Freiburg im Breisgau). City bicycle which allows people travel within city (inside city e.g Hameln, Klein berkel). They