The car was parked too close to a crosswalk.此处close是什么使用方法呢？

close可以是形容词，也可以是副词。本句中close为副词，被to介词短语修饰后构成副词短语作地址状语。下面是,《韦氏高阶》副词close词条下的例句：

Don't drive so close to the car in front of you.