Wet drives must not reduce fetal pressing

Wet, rainwater regards “ lubricant as ” , the attrition force of road surface is much smaller, encounter accident situation, operation apply the brake wants a car to stop, its distance is longer than wanting at ordinary times.

For safety, wet drive a vehicle besides reduce speed, outside driving carefully, some drivers still are when monsoon arrival, perhaps should run in the light of wet very very remote region, long time, by experience the one part air in tire of designed dropt car, make tire a few flatter, in order to enlarge the interface with the ground, increase attrition power, prevent slippery birth, shorten brake distance, avoid the happening of contingency.

This method is opposite after all incorrect? Somebody ever had a test technically, the result discovers a tyre pressure to lower however, after waiting for tire to be out of shape, brake walks in rain, should grow when space of apply the brake is more expensive than tyre pressure. Does the reason where?

Original car is in in rain when brake, the most important should have enough great power discharges the rainwater between tire and road surface, car ability halts smoothly. Conversely, if do not have enough power, the water between tire and road surface the platoon drives, cannot halt the car. The gas in tire is little, although increased,accumulate with ground interface, coefficient of friction also increases somewhat accordingly, but this kind increases very finite. And the touchdown area of tire is large, reduce to the intensity of pressure of floor unit area, the force when brake is abate, cannot very fast discharge the rainwater between tire and ground clean, like causing a bit water that remain to resemble lubricant, make a car glide longer distance.

On the freeway, when raining heavily, high speed travel can form film of a water between medium tire and ground and make tire flowing, we call this kind of phenomenon “ water film is flowing ” . Achieve 80 kilometers above when car speed per hour, water film is separated completely with respect to meeting general tire and ground, that is to say right now tire contacts the ground far from in travel, and glide on water like launch, accordingly, in travel of the high speed in rain, brake and ten million caution wants when changing direction.

Still have, just beginning to rain, especially drizzly before long, road surface dirt and sandy soil had been not washed completely clean previously, the sandy soil that absorbed water share turns into clay, slip very easily embryo, must notice. When after rain fell, sandy soil by complete rinse out, road condition just is met better.

Admonish again everybody, the fetal pressure ratio that normally the circumstance falls or keeps taller is better. Encounter wet, go up especially when freeway travel, must not deflate step-down.



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