One of the most important tips to safe cycling is to be as visible as possible to cars and pedestrians. In addition to head light and rear light I also attach a rear light to the back of the helmet for added visibility. This is a simple hack to add a rear light without zip ties or duck tape for a clean look. Note, this may not work on all helmets particularly ones with adjustment dials.
Things you'll need: Bicycle helmet Rear bicycle light Sharp knife