You should refrain from driving any vehicle if you are experiencing what physical symptoms?

Driving while experiencing nausea, dizziness, or fever is dangerous and generally prohibited under German traffic regulations. These physical symptoms can severely impair your ability to operate a vehicle safely, leading to reduced reaction times, impaired judgment, and an increased risk of accidents. It's essential to drive only when you feel fully capable to ensure your safety and that of others on the road. German traffic laws emphasize the responsibility of drivers to maintain their fitness to drive, and failing to do so can result in legal consequences.