Each road is color-coded according to its level of congestion or average travel speed.
CNN: Site-Seer: Web site maps make navigating easy
So bad, went the wisecrack, that the average travel speed of 8mph in the 1890s (by horse) was now, in the era of the automobile, still 8mph.
FORBES: Drive-By Pricing
Refurbishment work at Reading station will mean trains travelling between London and Cheltenham Spa will travel at an average speed of less than 50mph.
BBC: Platform work to delay Paddington to Cheltenham trains
The time it takes for the vehicle to travel between both points is used to calculate the average speed.
BBC: The new speed check system will be operating near Newry
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