An advantage of driving a car over riding a motorbike is the automatic safety cell you get by sitting inside the cabin. Motorcyclists are often exposed to not only the elements, but are vulnerable to accidents as well.
Spare a thought for this lucky bike rider. Possibly oblivious to the events unfolding behind him, he manages to escape harm while three cars are involved in the accident.
The other lesson is to not get involved in street racing. While you can turn your car very quickly in GT5, in real life the outcome is rather different. Watch the car diving to the left to see what we mean.