Cov qhov rooj hluav taws raug faib ua Qib A, Qib B thiab Qib C raws li lawv qhov hluav taws kub. Lub sij hawm tiv thaiv hluav taws ntawm Class A qhov rooj hluav taws yuav tsum tsis pub tsawg tshaj 1.5 teev, qhov hluav taws kub hauv chav B yuav tsum tsis pub tsawg tshaj 1 teev, thiab qhov hluav taws kub ntawm Class C yuav tsum tsis pub tsawg tshaj 0.6 teev. Qhov chaw sib txawv yuav tsum tau nruab nrog lub qhov rooj hluav taws ntawm cov qib sib raug rau kev siv.

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