A road sign has again fallen from above a Melbourne freeway, weeks after a woman driving near the same spot was lucky to escape with her life after her car was crushed by a falling sign.

An image from dashcam footage showing the sign which fell on the Tullamarine Freeway in January. Credit:Nine News

Known as a gantry identifier, the sign came down on the Tullamarine Freeway between the Bell St and Napier St exits on Friday afternoon.

That stretch of freeway was upgraded about 12 months ago as part of the CityLink-Tulla Widening project.

The identifier is not used for navigation, but rather the identification of freeway gantries.