I found these two signs at a construction site in my neighborhood. Written in Hakata-ben, they sound more familiar, softer perhaps, and are probably more effective than if they had been written in standard Japanese.
In standard Japanese the sign would read: 危ないので、入ったらいけないよ (Lit. “Because it is dangerous, do not enter.”)
. . . ken means . . . kara or . . . node, and expresses a reason or cause.
As we have seen in another posting, in many parts of Kyūshū, the i-ending of adjectives is replaced with -ka, so abunai (dangerous) becomes abunaka.
. . . ikenai is ikan in Hakata-ben, similar to akan in the Kansai dialect, but much less frequently used.
. . . to can added for emphasis or as a question marker.
. . . bai in standard Japanese is . . . dayo.
Again, in standard Japanese the sign would read: 工事しているので、立入禁止ばいのよ (Lit. “Under construction, entering is forbidden.”)