Here's why:
* Blank verse is written in unrhymed iambic pentameter. This means each line has 10 syllables with an alternating pattern of unstressed/stressed.
* "Sidewalk Racer" does not follow a strict metrical pattern. It uses various rhythms and lengths of lines to create a sense of movement and energy, fitting the subject matter.
* The poem also rhymes. There are rhymes within the lines and also across stanzas.
Therefore, while "Sidewalk Racer" is a wonderful poem, it does not adhere to the formal structure of blank verse.