When used with the 格助詞（かくじょし） (case-marking particle) に, the う-Verb 沿（そ）う ‘to run alongside’ in its て-form expresses that something is going ‘along with (A)’, ‘in accordance with (A)’, or ‘in line with (A)’. This is primarily in relation to laws, conventions, traditions, needs, and other things which are not usually deviated away from. The nuance with this particular grammar structure is that (A) is the controlling factor, and (B) is being done with that in consideration.
may also appear with the verb in its standard form when paired with a second noun, in order to modify that noun.
In accordance with company rules, please make sure to begin overtime after clocking out.
We would like to proceed in accordance with the client's wishes.
We will do our best to build you a home in accordance with your needs and within your budget!
As the base meaning of 沿（そ）う is ‘to follow along’, it will also regularly be seen in relation to going along some specific path or street.
While this grammar structure is relatively formal, when literally meaning ‘alongside’, it will be used fairly frequently.