Changes

You must go to Letňanská (e.g. bus 186 or 233 195, 140, 158 from Palmovkametro Prosek). Then going down from the bus, you can see the entrance of the motorway straight ahead. Put yourself so you have the motorway on your right, then cross the street (going north then), and then the parking, and go behind the buildings, looking for a small bridge (“most” in Czech), going above the motorway. From there you will see the petrol station. There are not so many people stopping there, but they all are (almost) going in the good direction. Just ask if they are going north (“sever”) or if they can just let you on the next petrol station (“příští pumpa”/“prschieschtee pumpa”), where there will be normally more cars.