Comment by heavyset_go

> The park could contain loose soil on the edge of a cliff, so any vehicle driving there could cause a landslide that topples the vehicle over the cliff and could kill anyone on the beach below. No vehicles in the park.

Have you ever looked at the warning signs on water heaters? They make it instantly clear what the dangers are and how bad they can be. A "No vehicles in the park" sign in that situation would be the equivalent of just putting "Caution: Hot" on a water heater.

Similarly, parks have signs with people literally drowning and being killed to make it abundantly clear how dangerous they can be.