Double speed limit signs

[1Jerseydevil]

Don't have pictures, noticed yesterday along Rt 539 the speed limit signs are doubled, one offset behind the other by from 6" to maybe 2'. Anyone know the purpose? If replacing the signs why not pull the old one?
Has this been noticed anywhere else?

 

[Teegate]

I saw them also. It appears to me they are replacing them and someone was to take down the old ones. It apparently did not happen. We shall see.

 

[NJChileHead]

Maybe this guy was the foreman of the project: