Earlier quoted context omitted.
The N chevrons away on those roads are often ludicrously far apart. It it well over the 2 second rule and nobody follows it.
There is no common 2 second rule, afaik. There is a 3 second rule, which is probably why they feel too far apart to you.
It’s a UK thing:
https://www.gov.uk/government/news/national-highways-urges-d...