As any Classic Mini owner will know, when the oil level is seriously low you risk losing oil pressure on right-handers, unless you slow down a lot. If it happens anyway, the procedure is to switch off the engine, coast round the bend, wait a few seconds and then bump-start. This means the car slows sharply, without the brake lights coming on. I did this once in a Mini Scamp (kit car with a square tube-steel chassis that sticks out at all the corners): when I next looked in the mirror the tail-gater was at a safe distance...

BTW there was only one situation on the road I went out of my way to avoid: going round Hyde Park Corner. On a push bike.