“Reasonable speed” is a speed:

1. Correct answer: That is adjusted to the road conditions and circumstances and does not exceed the speed limit.
2. The speed limit on that road, under all circumstances.
3. That the vehicle passengers wish to drive at. The passengers are always right.
4. That is adjusted to the conditions and circumstances, and always exceeds speed limit.

WhyA reasonable speed suits the road and the circumstances and is not above the limit. The limit is a ceiling, not a required speed; no circumstances allow exceeding it.