A graphic homophobic sign hung above three northbound lanes of the M1 through Springwood on Tuesday took aim at the media, government and the LGBTI community.

The sign was hung over the side of the Watland Street overpass and featured hand-drawn images of both male and female reproductive organs, telling passing motorists to "wake up".

A picture of the sign was posted to a Facebook page and attracted comments and jokes about the "childish illustrations".

"Ashamed this is Brisbane," one person wrote.