Difference between Bypass something and Pass something by

by-pass something—

1. make a detour (round a town, etc.):

• The scheme has been referred to as “the Selborne by-pass,” but it does not bypass Selborne at all.

2. avoid or ignore smth. (by using an alternative approach):

• I will now try to explain in detail how to bypass this problem.

pass something by—walk past smth. (without paying attention):

• You take it for a stone cross … and you pass it by incuriously.