I trust you've also seen the Wikipedia article cited elsewhere in these comments, where copying fictitious map entries was also ruled non-infringing? A map is ostensibly a presentation of facts, and while there are creative decisions involved that can be copyrighted, trap streets are not among these decisions. In the U.S., at least, it's not enough to establish that copying took place, if facts are the only things being copied.

And that's a good thing. If intentional factual errors were copyrightable, newspapers would fill their articles with misspellings and falsehoods in hopes that they could sue competing publications out of existence.

http://en.wikipedia.org/wiki/Trap_street#Legal_issues