Last week the speed indication displays returned to Manchester Road.
As well as showing drivers how fast they are going, the signs display a happy face for vehicles travelling under the speed limit and a sad face for those exceeding it.
The idea is that they slow cars down by making drivers aware when they are driving at unsafe speeds. The speed limit for this stretch of road is 30mph.
Speed indication displays were installed in a similar locations on Manchester Road in July 2010 and January 2011.