A heavy fog can quickly set on any day in UludaÄ, even on a perfectly sunny one. With the loss of sight of natural distinguishers, it becomes fairly hard to follow the trails, especially on the higher meadows of the mountain, so stay ahead of weather forecasts if you're planning to hike. If you are trapped in fog, the best would be to wait until it goes away—it can rise as quick as it forms.
Bear encounters may take place in the remoter parts of the mountain.
fees/permits
A flat rate—which doesn't depend on the number of passengers—for vehicles is charged at the national park gate. Bigger the vehicle, more expensive the fee though not prohibitively so.