Engineers who design and maintain the road network must be able to offer consistent standards that can satisfy the road user’s need for information and guidance. Traffic authorities depend on signing for the efficient control and movement of traffic, for enforcement of traffic regulations and, most importantly, as an aid to road safety. It is therefore recommended that all major traffic signing work should have been designed or checked by someone with an appropriate qualification.
According to the Traffic Signs Manual (section 1.3.4) an example qualification would be the Institute of Highway Engineers’ Professional Certificate in Traffic Sign Design that allows applicants to demonstrate their experience and produce work to the required standard. A designer holding a Practitioner or Expert level Certificate would be likely to demonstrate the skills needed to adequately check traffic signing work. For more information please see: http://www.theihe.org/professional-certificates