What is the steepest gradient an average car can drive?

I believe about 32% is about as steep as you would dare to take the ';average'; car. First gear only on that!


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Caltrans didn't give much, niether did ushighways. I tried my bestWhat is the steepest gradient an average car can drive?
40-47 degrees from the horizontal if they are going to start on the slope, the number could be increased if the car could get a run-up to speed before encountering the gradient.