They calculate it by assuming that you will be driving at the speed limit of the given roads.|||Most maps when getting directions ask you for the parameters you want.
Fastest, scenic, coastal, stops, diversions, motor ways or not, Tolls or not, A roads, B roads etc.
Then the software works it out using the parameters you have stipulated.
I have family in Cornwall about 300 miles away. I tried out of curiosity mostly, different route scenarios and found that there was a three hour difference between the fastest and the slowest times although the distance was within a 30 mile + or - difference.|||What the other guy said.
It takes no note of anything other than the legal limit for roads; so whether that road is a bullet straight hard top or a twisty single track road they'll say, in the UK, that you will be driving at sixty.
This is fair enough, as to do it differently would be a bigger logistical nightmare than Streetview.|||It uses speed limits provided by our data providers,which generally get the information from road signs or public records.
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