it a hypothetical in case I ever had some odd problem I could not explain.
Perhaps I should have said "two signals spaced less than 2 miles apart, but with one facing in the wrong direction"- will that result in a slowdown. If that remains a confusing question just leave it. Not life threatening. Thanks for your patience.
Note: I assume that signal spacing greater than 2 miles causes a 1/2 speed slowdown. If that assumption is wrong then the question is invalid.