A friend of mine actually does it (with his eyes open)
On a motorway, when it says the turning is in one mile, he counts to sixty and turns the wheel (if he's going 60mph that is, otherwise he can't be arsed cos he can't do maths)
( dr_fonz, Tue 27 Jan 2004, 15:25, archived)

We shall
try 20 mph to start with and do the Maths. (X3)
( Toma_o, Tue 27 Jan 2004, 15:29, archived)