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Rain can make road surface produces seeper, the car is be expert at the tire when sailing produces water film effect between meeting and road surface, namely rainwater is formed between tire and road surface thin thin film of a water, reduce the adherent force of tire and ground and attrition force. Accordingly, attach most importance to especially in wet to the examination of tire should, examination content includes the decorative pattern type of tire and decorative pattern deepness. The fore-and-aft decorative pattern of tire is helpful for increasing the catchment capacity of tread, raise a car to hold accuse stability. Additionally deepness of tire decorative pattern also drives to wet safety have crucial effect, research shows deepness of the decorative pattern below coequal speed circumstance is deeper, the catchment capability of tire is stronger, tread and the area of ground surface contact are larger also, can provide greater rolling friction power for the car thereby. Summertime wet is frequent, answer to check deepness of car tire decorative pattern and embryo in time to press at that time, ensure the tire that uses correct figure, wet drives to control speed even, had done these to prepare ability to increase the safe index of the car.