Clearly riding a bicycle on roads designed for much heavier, much faster vehicles isn't the safest pursuit in the world. Of course you would be much safer sitting at home. But that's a calculation you make any time you decide to step out the door. The way some people talk about cycling you'd think that merely getting on a bicycle for longer than 10km means instant death. That's obviously not the case, because there are always far more people who have successfully cycled any given stretch of road than ones who have died on it. The question people should ask themselves is if the risk is worth the benefits for them. And, if they have decided yes, then it's certainly more enjoyable to not spend every moment on that road terrified of other vehicles, whose behavior you have very little control over. If you want to do it, just do it.