Under Pennsylvania law, what light configuration is necessary for night riding on a bicycle?

Under Pennsylvania law, when riding a bicycle at night, it is required to have a white light mounted on the front of the bicycle and a red reflector or a red light on the back. This configuration is essential for the safety of the cyclist, as it enhances visibility to other road users. The white light at the front allows the rider to illuminate the path ahead, while the red light or reflector at the back serves to indicate the presence of the cyclist to vehicles approaching from behind.

This requirement aligns with general traffic safety regulations aimed at reducing accidents and ensuring cyclists are seen in low-light conditions. Having only reflectors does not provide an adequate warning or visibility for the cyclist, as reflectors work primarily by reflecting light from other sources rather than emitting their own light. Similarly, while flashing lights can help enhance visibility, the key requirement at night remains the white light in front and the red light or reflector in the back. This balanced approach helps to ensure that cyclists are as visible as possible, promoting safer riding at night.