What is the distance of lamp posts?

the distance of lampposts and height can vary depending on how busy the road is and the speed limit (ideally it can be 100 yards for every 10mph the limit is) so yes in a 30mph limit road they would normally be around 300 yards apart whereas on the motorways/dual with the National 70mph limit they would be further apart more like 700 (100x7) yards but of course cos of the speeds matching the distance apart it would be hard to notice the difference much unless u were going at a crawl