The Magic Hill up in Louth (or ‘The Angel’s Highway’ as it’s sometimes called) is one of a number of magic roads in Ireland where, if you park at the ‘bottom’ of the hill, turn of the engine and shift it out of gear, your car will actually run back uphill.
Magic roads are, in fact, what are sometimes referred to as ‘gravity roads’ (that’s an area where the landscape creates an optical illusion so that a downhill slope actually looks like an uphill slope). There are actually quite a number of such places around the world (and there’s a least three of them in Ireland that I’m aware of). Most have their own folklore associated with them although most of that lore is usually derived after the invention of the motorcar.
When my Dad took us on our very memorable trip to Dundalk (county Louth, we went to see the magic road there and there’s an amusing summary of it here on youtube: http://talkofthetown.ie/2014/02/25/the-real-magic-hill/
It’s hardly deep, intellectual folklore but it’s great craic!!