What the post doesn't explicitly say, but does depict in the accompanying image, is that a lot of cyclists choose to bike in the rain while holding an umbrella.
Not like this crazy banana-helmet dude.
But more like, you know, one hand on the handlebar and one hand on the umbrella.
Which sounds crazy dangerous, right?
Although you can apparently ride with 1.6 hands on the handles like the Japanese:
In Japan, when it rains it is common to see cyclists holding umbrellas. I watched closely, and it seemed like they hold the handle between their thumb and first finger, while keeping the other three on the brake lever.
Of course, sidewalk riding is also common there, so perhaps Japanese practice is not the safest in the world.
All the same, I don't think I could I could do it. I imagine it would be far too distracting and akin to biking while talking on your cell-phone. And cell-phoning while driving is something I wasn't on board with even before reading Traffic.