Rain creates multiple hazards that significantly increase bicycle accident risks throughout California. Wet pavement reduces tire traction for both bicycles and motor vehicles, extending stopping distances and making sudden maneuvers dangerous. Painted road markings, metal surfaces like manhole covers and railroad tracks, and oil residue that rises to the surface when rain first falls become extremely slippery, causing cyclists to lose control even when riding carefully.
Reduced visibility is another critical factor in rain-related bicycle accidents. Drivers often fail to see cyclists in heavy rain, especially during dawn, dusk, or nighttime hours when visibility is already compromised. Fogged windows, overwhelmed windshield wipers, and water spray from other vehicles further impair drivers' ability to detect cyclists sharing the road. Many drivers also fail to use headlights appropriately in rainy conditions, making it even harder for cyclists to be seen.
Driver behavior changes in rain often contribute to bicycle accidents. Some motorists drive too fast for conditions, fail to increase following distances, or make aggressive lane changes without properly checking blind spots. Others become distracted by challenging driving conditions or impatient with slower-moving cyclists. Hydroplaning, where a vehicle's tires lose contact with the road surface due to water buildup, can cause drivers to lose control and strike nearby cyclists. Understanding these common causes helps establish liability in rain-related bicycle accident claims and demonstrates that weather alone doesn't excuse negligent driving behavior.