Motorists, if I'm traveling at 25mph on a road with a 25mph speed limit, you don't 'have' to overtake me. You'll arrive at a road with a higher speed limit soon enough. Then you'll be able to overtake me without looking like a total wanker.
But if you do decide to overtake me, for goodness sake COMMIT! Don't pussyfoot around wondering if you should accelerate while you drive next to me in the oncoming traffic lane for ten seconds. Call me crazy, but I've heard that the oncoming traffic lane can contain oncoming traffic.