I always found most of the French roads to be very nice to drive and cycle on, perfectly smooth.
One of the reasons I was told is that over in France they build most of their utility manholes or pipe service points off of the highway, this means any future digging doesn't interfere with the road surface.
Over here I'm sure we've seen a newly laid piece of tarmac ripped up to lay a pipe and then the repair disaggregates over time leaving a pothole.
Then there seems to be vast difference in the quality of the materials used on the roads, concrete lasts but is noisy on the motorways other tarmac types fall apart after only 6 months.
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