There’s an infamously crap and wonderful stretch of the M25 heading south where the tarmac had been replaced with slabs of concrete that are slowly separating and crumbling and always make an excellent sound when the tyres run over the joins, but this time in particular it was vibrating with a really nice drone which kicks in at 01:24
I then sent the recording to Nat Lyon of Experimental Trash who made an excellent track with it and has made all the samples free for anyone to use.. experimentaltrash.com/m25l05/m25l05.html
(Listen to “First Room” and “Second Room” for Nat’s tracks.)