Defensive driving is:

You drive defensively when you identify dangerous driving situations and take action before an accident occurs. Defensive driving helps prevent conflicts with aggressive, offensive, discourteous, careless, inattentive, impulsive, ignorant, or intoxicated drivers or pedestrians.

• Identifying dangerous driving situations and taking action to avoid accidents.
• Defending yourself against poor drivers by getting ahead of them in traffic.
• Following the vehicle ahead of you at a close distance.
• Quickly changing lanes and shifting in and out of traffic congestion.