By the way, I felt it was dangerous to run alone on a vast plain with no people! Where I live, accidents involving people riding bicycles and colliding with cars and dying occur frequently.
So, I think you should wear a helmet that protects your head and elbow and knee protection.
So sad to hear that so many accidents there. But here the traffic is so less and roads are too spacious with a large section dedicated to only for bicycles. And there are so many CC cameras every 300/400 hundred meters, so no one break the rules here and the cycling routes are so safe. You can't make any accidents here due to the strict rules and regulations here with the strong monitoring technologies.
I believe that you should always be prepared for unexpected accidents where no one is around.
You should have a cell phone and be prepared to call for help.
From what I remember, there are very few hospitals in Beijing where foreigners can be admitted.
Thanks for your concerns, I always keep my map on in my cell phone and keep on the charge on my cell phone. There are many hospitals now for foreigners and you can admit anywhere if you have someone to help you with the Chinese language.
Thanks again for reading my post.