Flash flooding poses a significant risk to drivers, especially in low-lying areas, arroyos, and mountainous regions. Water levels in normally dry washes can rise rapidly, creating dangerous conditions. Roadways may become impassable due to standing water, debris, or damage. Motorists are advised to avoid unnecessary travel during the heaviest storms and to exercise caution when driving in affected areas. The risk of hydroplaning and reduced visibility further increases the potential for accidents.