5 ms·
30 kph is a speed limit and thus an exact number, not an approximation to 1 SF. Thus, 18.6 mph is more correct than 20 mph.
by karthikb 10y ago
30 kph is a speed limit and thus an exact number, not an approximation to 1 SF. Thus, 18.6 mph is more correct than 20 mph.
- masklinn 10y ago> 30 kph is a speed limit and thus an exact number, not an approximation to 1 SF. Thus, 18.6 mph is more correct than 20 mph. No, because the imperial speed limit corresponding to 30km/h is 20mph, and imperial drivers would have encountered that and thus would have a clear and absolutely trivial frame of reference. Likewise 50km/h and 30mph. 18.6mph and 31mph is not correct, it's worthless pedantry completely missing the point to the disservice of the reader.
- karthikb 10y agoI was responding to parent who was making the argument based on significant figures. Speed limits are exact (though enforcement may not be!). But I completely agree that from a practical perspective, 30 kph = 20 mph, 100 kph = 65 mph, and so on.
- henrikschroder 10y ago> Speed limits are exact And this is exactly the kind of worthless pedantry that masklinn called out.