[ARCHIVE ANSWER]
You did the right thing by leaving the car, but you should always weigh your pot in a safer location. Be careful and remember NEVERGETBUSTED!! We need you on the outside!
Great hiding spots are always better than poor hiding spots; however, if a K-9 alerts near your great hiding spot, the Cops are likely to examine much closer and find the contraband. Try not to drive around with it too much. Use the method I teach in NeverGetRaided that outlines exactly how to sell pot.