Why are mountain roads generally made winding upwards rather than going straight up?

<p><span lang="EN-IN">This is a Short Answer type Questions as classified in NCERT Exemplar</span></p><p><strong><span lang="EN-IN">Explanation-</span></strong><span lang="EN-IN"> while going up a mountain the force of friction acting on a vehicle of mass m is f=<span contenteditable="false"> <math> <mi>μ</mi> <mi>R</mi> </math> </span></span><span lang="EN-IN">&lt;!- [endif]-&gt;</span>&lt;!- [endif]-&gt;</p><p><span lang="EN-IN">=<span contenteditable="false"> <math> <mi>μ</mi> <mi>m</mi> <mi>g</mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>θ</mi> <mo>.</mo> <mi> </mi> </math> </span></span><span lang="EN-IN">To avoid skidding force of friction should be large and therefore cos<span contenteditable="false"> <math> <mi>θ</mi> </math> </span></span><span lang="EN-IN">should be large and <span contenteditable="false"> <math> <mi>θ</mi> </math> </span></span><span lang="EN-IN">should be small. That is why</span><span lang="EN-IN"> mountain roads generally made winding upwards rather than going straight up.</span></p>

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