Ride Tip for Group Ride - Etiquette:              Riding on gloomy, short, fall days: Many days in the fall it can be foggy, cloudy, or rainy, and generally rather gloomy. In these conditions, bicyclists are urged to use a blinking headlight and twilight, with FRESH batteries. When the conditions are grey, bicyclists are even harder to see than on bright and sunny days, and a good head and tail light attracts attention.  This brings us to:              Avoid the "door zone": When riding beside a row of parked cars, it is best to stay at least four feet away from the cars. Doors on modern cars often open out three to four feet or more, and window tinting makes it impossible to see what the driver/passenger is doing. Very often drivers swing out their door without looking at all, or just looking for approaching cars.