What is the minimum safe following distance a motorcyclist should maintain behind the preceding vehicle under ideal, dry daytime road conditions?

1. 0.5 seconds, to draft behind the lead vehicle and save fuel
2. At least a 2-second time gap (increasing to 3–4 seconds or more in wet weather, fog, or nighttime)
3. Exactly 2 meters at all speeds from 20 km/h to 120 km/h
4. Following distance does not apply to motorcycles because they can stop in zero meters