Road Speeds used in these tables
These mileage charts use typical international road speeds, and not the legal speed limits. The road speeds are used to find the quickest route (i.e. faster roads will tend to be used) and to calculate the final travel time.
Road speeds have been chosen to be applicable globally, and are typically applied by road type in the OpenStreetMap database. In turn, these road types are defined globally. Although the absolute speeds might be incorrect for a specific country, the relative speeds for different road types are generally accurate. This means the calculated routes and driving distances are good, even if the estimated travel time is less accurate.
The following road speeds are applied:
|Road Type||Speed (kph)|
Maximum road speeds are applied according to the road surface. Asphalt, concrete, and paved roads have no maximum applied. Cement, compacted, and fine gravel roads have a maximum of 80kph. Pacing stones, metal, and bricks have a maximum of 60kph. Grass, wood, sett, grass paver, gravel, unpaved, ground, dirt, pebblestone, and tartan all have maximums of 40kph. Cobblestones and clay surfaces have a maximum of 30kph. Earth, stone, rocky, and sand surfaces have a maximum of 20kph. finally, mud surfaces have a maximum of 10kph.
Rough roads also have maximum speeds applied, ranging from 80kph for 'intermediate' through to 5kph for 'very horrible'.
A number of nation-specific maximums are also applied:
|UK||National Speed Limit - Single||60mph|
|UK||National Speed Limit - Dual||70mph|