The Utrecht City Moat is the Cheonggyecheong* of Europe – the demolition of an underused motorway for an historically significant waterway. The result, opened in 2016, is dramatic:
The mid-70s motorway meant to feed traffic into the city centre was another example of the excesses of motordom: vastly overscaled and essentially unneeded.
Traffic now has only one lane in each direction, which turned out to be enough.
It took four decades to convince local government to restore the moat. The story is here:
*Cheonggyecheon is the nine-kilometre restoration of an historically important river covered over for an elevated freeway – and now one of the jewels of Seoul: