The BBC compares what bike lanes are like on both sides of the English Channel..
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a segment
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.French 'priority'
The French tracks are also broader - legislation says they must be three-metres wide. This is important, as it helps users keep out of each other's way - dogs and cyclists for example, though I suspect no amount of space would have spared me a clash with Boris, a sharp-tempered hairy terrier, who seized my trousers in his teeth on the Forest Way, and managed to run for several yards without letting go (a feat made possibly by Lycra).

At present, as French officials generously note, a greater proportion of the route on the British side is off-road, even if the quality of the French cycle tracks is superior.
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http://www.bbc.co.uk/news/magazine-11447348