Defensive Driving in California
Defensive driving means anticipating hazards before they happen. It's the foundation of safe driving in California and a key topic on the DMV knowledge test.
Following Distance
Use the 3-second rule at minimum: pick a fixed object, and when the car ahead passes it, count to three. If you reach the object before counting to three, you're too close. Increase to 4 seconds in rain or low visibility, 5 seconds on gravel or ice, and even more when following large trucks or motorcycles.
The SIPDE Method
Defensive drivers use a systematic scanning process: Scan — constantly move your eyes across the full road environment; Identify — spot potential hazards early; Predict — anticipate how hazards might develop; Decide — determine your response before you need it; Execute — carry out your response smoothly and safely.
Managing Space & Blind Spots
Always check your mirrors every 5-8 seconds. Always check your blind spot before changing lanes by briefly turning your head. Avoid lingering in other drivers' blind spots, especially large trucks. Maintain a space cushion on all sides — if one escape route is blocked, you should have others available.
Key Rules at a Glance
- Minimum following distance: 3-second gap at all speeds
- Following distance in rain: 4+ seconds
- Mirror checks: Every 5-8 seconds
- Blind spot check: Turn head briefly before each lane change