Tulyar often posts about this part of the Road Traffic Act:
https://www.legislation.gov.uk/ukpga/1988/52/section/39
39 Powers of Secretary of State and local authorities as to giving road safety information and training.
(2) Each local authority must prepare and carry out a programme of measures designed to promote road safety.
(3) Each local authority must carry out studies into accidents arising out of the use of vehicles on roads or parts of roads that it has responsibility for. The LA must then take such measures as appropriate to prevent such accidents.
The Act gives various woolly sounding examples such as "the dissemination of information and advice relating to the use of roads, the giving of practical training to road users or any class or description of road users" but does include "the construction, improvement, maintenance or repair of roads" and "other measures taken in the exercise of their powers for controlling, protecting or assisting the movement of traffic on roads".
Given that the RAIB is now involved in the simple-sounding case of a signal passed at danger, maybe it's time LAs took action on every instance of RLJ. Perhaps car drivers should be made to operate under similar restrictions of block signalling.