It is a freezing Saturday night in December. You spot a car driving the speed limit with its windows rolled all the way down. You know that drunk drivers frequently use the cold air to help keep themselves awake while driving. The driver's eyes are fixed on the road, and he has what appears to be a death grip on the steering wheel. You follow the car for 10 miles because you have a gut feeling the driver is drunk. Finally, the car weaves in its lane and you pull the driver over for erratic driving. You confirm your suspicion of drunk driving when you smell the odor of alcohol on the driver's breath. The driver fails the field sobriety test and is arrested for drunk driving. Did you have probable cause to stop this motorist?