[Symbiote]

In Britain they teach "2 seconds", and suggest measuring it by counting from a sign/lamp, road marking etc. I think that corresponds more-or-less to the official numbers [1], which under 65km/h are very close to the German way, though at motorway speed the UK has a little extra distance.

I had to look up the name of the Leitpfosten in English, "distance marker posts". They're at 100m intervals on motorways (I knew that bit).

A different style is called "hazard markers" or "hazard marker posts" and used only where appropriate. There are also snow poles on some roads, mostly in Scotland. I can't see any specified distance for either type.

[1] §126 of https://www.highwaycodeuk.co.uk/control-of-the-vehicle.html

(The odd mixture of units is consistent with normal British usage, as is the construction of the road in metres but the signing of it in "yards" (often actually metres).)