Izigxobo zezimpawu zethrafikhi ziyingxenye ebalulekile yengqalasizinda yomgwaqo, ehlinzeka ngendlela yokubonisa izimpawu zomgwaqo kanye nezimpawu zokulawula ukuhamba kwezimoto nokuqinisekisa ukuphepha kwabahamba ngezinyawo. Lezi zigxobo ziza ngezindlela ezehlukene, okuhlanganisa i-octagonal, cylindrical, kanye ne-conical, ngayinye ine-ow yayo ...
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