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The posted speed on a curve is

A safe for cars in good weather.
Explaination
Each curve has a safe "design speed," which is its safe speed for cars in good weather. However, at that speed, a bus is more prone to rolling over. And it may not be safe for any vehicles to travel at that speed in bad weather. In particular, a bus could go sliding right off the road. For safety on curves, slow down below the posted speed. If your bus is leaning outward on a banked curve, you are driving too fast.
B safe for cars and buses in bad weather.
C all of the above.
D safe for buses in good weather.