Why are car crashes more dangerous at higher speeds than at lower speeds

The impact of speed and velocity at greater speeds affects the car much greater than at slower speeds due to impact and timing and velocity and speed.

When you go fast it hits harder so it causes more damage and less damage when slow,
Hope this helps xoxo

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.