What does this sign mean?

这个标识代表什么意思？

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

这不是不限速。车辆类别另有较低限速时须遵守较低值，遇到弯道、雨雾或其他危险时也应进一步减速。