Lights not working properly

The Traffic Lights on the A52 slip road going onto the Sandiacre Interchange roundabout seem to have suddenly started only letting 3 or 4 cars through at a time whereas before they let a lot more through than this, they only seem to stay on for a few seconds all of a sudden. This caused major tailbacks today at rush hour on the slip road and the traffic was backing onto the A52 itself nearly causing several accidents as there was no warning on the illuminated sign on the A52. Also as the lights kept changing so frequently people seemed to then start going through on red as they must've been fed up of waiting which again is dangerous and nearly caused a couple of accidents.