A compass on the windscreen was very helpful - if I knew which direction I was heading, and knowing whether I was going clockwise or anti-clockwise told me which bit I was on!
I bought a screen-mounted compass after joining a motorway in the wrong direction a few times. The roundabout signage just gave the names of towns/cities in each direction (which meant nothing to me in parts of the country I wasn't familiar with), and didn't mention 'North', 'South' etc. at all.