Rental car dashboards are configurable, but road signs are not. This guide gives you the speed-limit vocabulary of the world's most-visited countries in both km/h and mph, plus the distance anchors that make trip planning feel native.
Who measures in what
Km/h countries: all of continental Europe, Asia, Africa, South America, Australia, Canada. mph countries: the United States and the United Kingdom (roads only; fuel is in liters in the UK, which makes mpg arithmetic genuinely confusing there).
Speed limits at a glance
| Country | City | Rural | Highway |
|---|---|---|---|
| Germany | 50 km/h (31 mph) | 100 km/h (62 mph) | unmarked sections only (der recommended 130) |
| France | 50 (31) | 80 (50) | 130 (81), 110 in rain |
| Italy | 50 (31) | 90 (56) | 130 (81) |
| UK | 30 mph (48 km/h) | 60 mph (97) | 70 mph (113) |
| USA | 25-35 mph (40-56) | 55 mph (89) | 65-80 mph (105-129) |
| Japan | 40-60 (25-37) | 60 (37) | 100 (62) |
| Australia | 50 (31) | 100 (62) | 110 (68) |
Fine thresholds are typically 3-10% above the posted limit (France: fixed +5 km/h under 100, +10% above; Germany: +3% tolerance minus 3 km/h). Cameras do not care that you were converting units in your head.
The mph ↔ km/h anchors
- 30 km/h = 19 mph: European residential streets
- 50 km/h = 31 mph: every city in the world, basically
- 100 km/h = 62 mph: standard rural limit
- 130 km/h = 81 mph: top highway limit where it exists
- The flip trick: km/h to mph is about × 0.6, mph to km/h about × 1.6
Distance anchors for planning
- Paris → Amsterdam: 500 km (310 mi), 4.5 h by car, 3 h 20 by train
- Rome → Florence: 275 km (170 mi), 3 h by car
- Los Angeles → Las Vegas: 435 km (270 mi), 4 h
- London → Edinburgh: 650 km (400 mi), 7 h by car, 4.5 h by train
- Tokyo → Kyoto: 450 km (280 mi), 2 h 15 by shinkansen
Rule of thumb for a road-trip day: 500 km or 300 miles is a full driving day with stops. Plan no more than two of those back to back.
Other travel units worth knowing
- Nautical miles (1.852 km): flights and shipping. A "knot" is 1 nautical mile per hour. A 900 km flight is about 486 nautical miles.
- Elevation: trail signs in meters in most of the world, feet in the US. A 3,000 m pass is 9,842 ft.
- Fuel: sold in liters almost everywhere; pump prices per liter feel five times cheaper than US per-gallon prices until you convert. Our L/100km ↔ mpg converter handles the efficiency side.
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