I've been riding almost a month now, and I'm still having trouble with some stoplights. Busy intersections are usually not a problem, but I have a few stoplights on my usual path that cause me trouble. These are the ones on usually non-busy streets that cross a 4-lane street. I'm usually the only one there and I'm unsure if the sensors on the street work. Are they supposed to be able to detect a single rider? It seems most times I sit there until another car comes, and then the light almost certainly changes immediately. Should I be using the ped-walk and hit the button?