What does this sign mean?

這個標識代表什麼意思？

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It is not unrestricted speed. Lower vehicle limits apply, and curves, rain, fog or other hazards can require slower travel.

這不是不限速。車輛類別另有較低限速時須遵守較低值，遇到彎道、雨霧或其他危險時也應進一步減速。