Mazda 3 2004 knocking/thumping noise coming from front when going at or over 65 mph
 

Weird noise just started happening about a month ago. It's like a knocking type noise that really worries me to the point that I avoid going on the highway at all. Once it starts it'll keep going until I go under 65. It used to happen when going over 70. Now it happens even earlier. Any ideas?

Have you checked your ball joints