Caldecott, 39 km. By the time I'm on the road, it is almost dusk. It's dark but not just became it's late. Black clouds hover overhead. I look where it is light and head there.
When I get there, I realise the clouds are in a pincer movement: over where I start and where I head. Ah well, I train anyway. A nice loop, several km long, with no traffic lights at all.
Though I don't have much time to train, I put what I have into it, keeping my heart rate up. I keep my tyre pressure low for more rolling resistance. And it doesn't rain. Nice.