If the speed of the tram determines the ability to stop safely, on what in particular should the tram's speed be adjusted to?

The speed of any vehicle, including a tram, must be adapted to the prevailing conditions so that it is possible to stop safely at all times. The condition of the tracks and the weather conditions (e.g., ice, wet leaves) directly affect grip and braking distance. Furthermore, limited visibility reduces reaction time, which also necessitates a reduction in speed to ensure safety.