Speed limits can be useful to reduce accidents (though I do think they're also often used to line the state's pockets, especially on highways) but the fundamental responsibility is on the driver to drive at an appropriate speed for the context and conditions.
If you can't stop in time to avoid an accident such as a bus gently stopping, the speed limit is totally irrelevant -- it's on the driver to be alert and in control.
Speed limits can be useful to reduce accidents (though I do think they're also often used to line the state's pockets, especially on highways) but the fundamental responsibility is on the driver to drive at an appropriate speed for the context and conditions.
If you can't stop in time to avoid an accident such as a bus gently stopping, the speed limit is totally irrelevant -- it's on the driver to be alert and in control.