Forget lamp posts Street lights etc. The simple rule is, if there are no signs it is 30.mph any other speed has to be clearly indicated by signs. The only time 30 is shown is when leaving a higher speed limit.If that’s the rules then fair enough.. Think I ll sue my driving instructor from 30 years ago as he definitely didn’t tell me that:)
However how would a motorist know what the legal distance of street lights are when driving down a road before knowing what my speed to do without any signs?