If power steering assist is lost because the engine stops or the system is not functioning, the vehicle can be steered but it will take more effort.
It is important to take curves at a reasonable speed.
Traction in a curve depends on the condition of the tires and the road surface, the angle at which the curve is banked, and vehicle speed. While in a curve, speed is the one factor that can be controlled.
If there is a need to reduce speed, do it before entering the curve, while the front wheels are straight.
Try to adjust the speed so you can drive through the curve. Maintain a reasonable, steady speed. Wait to accelerate until out of the curve, and then accelerate gently into the straightaway.
There are times when steering can be more effective than braking. For example, you come over a hill and find a truck stopped in your lane, or a car suddenly pulls out from nowhere, or a child darts out from between parked cars and stops right in front of you. These problems can be avoided by braking -- if you can stop in time. But sometimes you cannot stop in time because there is no room. That is the time for evasive action -- steering around the problem.
The vehicle can perform very well in emergencies like these. First apply the brakes -- but, unless the vehicle has antilock brakes, not enough to lock the wheels. See Braking. It is better to remove as much speed as possible from a collision. Then steer around the problem, to the left or right depending on the space available.
An emergency like this requires close attention and a quick decision. If holding the steering wheel at the recommended 9 and 3 o'clock positions, it can be turned a full 180 degrees very quickly without removing either hand. But you have to act fast, steer quickly, and just as quickly straighten the wheel once you have avoided the object.
The fact that such emergency situations are always possible is a good reason to practice defensive driving at all times and wear safety belts properly.