Some types of interactive speed control signs require specific site authorisation from DTLR. Provided that the circular red border is retained, those that show a speed limit sign face (Diagram 670 of the Traffic Signs Directions and General Regulations 1994), do not require such authorisation, if the normal black legend on a white background is displayed as a white, off-white or yellow legend on a dark background.

The provision of interactive signs will only be considered at sites where:

a) there is a record of personal injury accidents, for which excessive speed is considered to be a contributory factor, or

b) 85th percentile speeds are more than 20% above the stated speed limit.

The County Council is correctly reviewing the policy of the introduction of interactive signs. Pending completion no further signs at new sites will be provided.