I hate to be too negative about the driving habits of my fellow Central Pennsylvanians, but it's all too common that they approach a stop sign at fairly high speed, slow down considerably while scanning quickly for cross traffic, and then accelerate rapidly if they think things are clear. This would only be mildly dangerous if there were only motor vehicle traffic. However, what often happens with a bicycle is that they miss you because of the A pillar, and then when they hit the gas again you are right in front of the car. So they never really see your headlight or your taillight -- no matter how bright it is. Side reflectors might work, spoke lights probably work, but the helmet light thing always works.