Back in my NSR days I used to either double it (and maybe add a bit) if I new the corner, or convert to mph if I was unsure. BUT, there were two corners on the back roads to Palmy Nth (via Shannon) that recommended 65kmh, and it was quite dodgy to take much more than 75km, so whoever the road engineer was who matched the recommended speed to the angle of those corners did a lousy job.
Don't get caught out guys. Unknown roads can be much more dangerous than your local tracks.
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