I travel pass by Yak Pak area so often. It formerly called as "Sam Yak Pak" as it used to be 3 ways intersection and one direction is the route to Pak Thong Chai district. (Sam Yak means 3-ways intersections and Pak is a short saying for Pak Thong Chai) Now it becomes 4 ways intersection connected with flyover. Still many peoples call the area "Sam Yak Pak", ... me too.