この標識は何を意味しますか？What does this sign mean?

この標識は何を意味しますか？What does this sign mean?
駐車禁止Stop in 50 metres
速度制限50 km/hMaximum speed is 50km/h
前方に横断歩道Maximum speed is 50mph
速度制限が100 km/hになるNo parking for 50 metres
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