Why are the handlebars on mountain bikes and road bikes strangely longer than those on regular bikes? Is there a special function?

Mountain bike handlebars: the advantages of straight handlebars are direct power, lighter than the same level of swallow handlebars, less wind resistance, the disadvantage is relatively poor maneuverability, swallow handlebars are the opposite. (Handlebar next to the two vertical out of the so-called vice handle function is uphill shaking the car to save energy and more comfortable)

Road handlebar: butterfly handle is the role of multiple grip position, it is easy to change the riding position according to the need to alleviate fatigue due to a position caused by a long time riding, but also can be lying down on the car to reduce the wind resistance (some cars will be equipped with a rest handle, mostly found in the road bike time trial car (triathlon) can be). The wind resistance can be greatly reduced so as to speed up, but not as comfortable as butterfly handlebars)

When cycling at 40+km/h, you can feel a great deal of wind resistance, so the wind resistance can not be ignored

.