The biggest one in Fifth Street!为什么用in而不用at,

street
英 [stri:t] 美 [strit]
n.大街,街道
街道； 街； 街上； 大街 复数：streets
She was accosted in the street by a complete stranger.
在街上,一个完全陌生的人贸然走到她跟前搭讪.
2.at the corner of the street
在街角
3.poor children going barefoot in the street
光着脚流落街头的穷孩子
4.They were arrested for brawling in the street.
他们因在街上打斗而遭到拘捕.
5.He owns the butcher's in the main street.
他在大街上开了一家肉铺.