In the US, text painted on roads reads bottom to top:
In the UK, it reads like normal text:
The task here is to come up with the longest text (measured in number of words) that can be read as an instruction to drivers in both US and UK use. This doesn't need to be a road safety/direction message per se, but relevant to driving or driving journeys.
So "STOP AHEAD" could be read as "AHEAD(,) STOP" scoring 2, while "ENTRY NO" isn't valid as the only sensible expansion is "ENTRY? NO" and not an instruction.
After having a loophole pointed out to me : the number of characters in a line should not exceed 8 unless they form a single (non-hyphenated) word. The exact number is based on examples seem in the wild (by me)