> Any vehicle on the road has a legal obligation to operate their vehicle safely and lawfully — that means a bike ought never be unable to stop in time.

Would you make the same argument about leaving unmarked construction equipment behind blind curves on the freeway?

Blocking or unexpectedly merging into downhill bike lanes in the city is similarly bad.

Coming down a hill at 20Mph in a bike lane that should be at least partially clear on a wet day (very common in Seattle) is perfectly legal. Running into a large unexpected object in the path is hardly the cyclists fault.

> perfectly legal

Well, not necessarily.

If your reflexes are good enough, and your brakes are good enough, and your tires are good enough, that you can safely stop a bike going 20mph on a wet downhill section, then yes; you are still in control of your vehicle and operating at a safe speed. No legal problems there.

But maybe your reflexes aren't that good because you haven't had coffee yet. Or maybe your brakes are worn down. Or maybe you're on crazy thin road tires that have effectively no traction going downhill in the rain. Or some combination of all three.

The point being, if it's not physically possible for you to stop that bike in whatever time interval is required, are you really operating that vehicle safely? Probably not.

And to the extent that you're legally required to operate at a safe speed and maintain control of your vehicle, your behavior would no longer be "perfectly legal."

So 20 mph + downhill + wet roads may very well be illegal for some combinations of cyclist and bicycle but not others. It seems premature to declare that perfectly legal in all cases.

I tried telling that to the insurance agency when I rear-ended a car that suddenly stopped in front of me. It didn't work.

Someone suddenly stopping shouldn't be unexpected, nor is it necessarily against the rules of the road. Hacker News is fun and all but consistently gets beaten by 15 seconds of googling e.g. https://www.nytimes.com/2014/05/28/nyregion/double-parking-i...

If you can't see whether there's a large object in your path within time to stop, you're going too fast. There could be a fallen or slow bicyclist in the lane.

This is so obviously, indisputably true. How can anyone be downvoting?

You’ve clearly never been going downhill on a bike and had someone illegally stop their car or pull out in front of you. Bikes take more distance to stop than cars.

You've clearly never considered the necessity of matching your speed to conditions and surroundings and whatever surprises they may hold.

I have. For close on fourty years of much cycling and driving. Which may be a contributing factor in my never having suffered an accident.

No, it's always their fault. /s

That’s the point. People in cars have to be able to avoid objects in front of them (whether that’s drivers suddenly stopping or other obstructions) and so do bicyclists.