What problem faces a vehicle driver who is driving at a high speed?

1. His response time is decreased, and thus his driving becomes more dangerous.
2. There is no problem at all: Research work has proven that in high speeds driving is more calm and relaxed.
3. Correct answer: The driver has very little time to properly respond to road events.
4. The driver's response time is significantly lengthened.

WhyAt high speed the driver has very little time to respond properly. The reaction time itself does not change; the distance covered does.