Because Hong Kong uses dollars too - Hong Kong Dollars (HKD) which are worth around $7.30 USD right now.
Also, Hong Kong was an English colony for 150+ years up until 1997. If you've been there you'd see the road system is identical to the UK - same signs, roundabouts, etc.
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Why does the sign say "$3,680"? At first I thought oh maybe that's in yuan but it has a dollar sign and is in english...
Because Hong Kong uses dollars too - Hong Kong Dollars (HKD) which are worth around $7.30 USD right now.
Also, Hong Kong was an English colony for 150+ years up until 1997. If you've been there you'd see the road system is identical to the UK - same signs, roundabouts, etc.
And for the curious, the HK$-yuan conversion rate is approximately 1-to-1 (maybe something like 0.97-to-1, but not a significant difference).