Passing a rattler...LOL
They can strike about half their length when coiled and ready, less when not ready..,,I said about. !!

Are you going to measure one ? I don't think so.

I've come up on more than a few, I don't get close enough to get struck at, the poison will rot the meat off your bones,

Remember your at or near max heart rate at the time and far from help.

So no I won't pass over or near one, I choose life with all my meat

If you can't safely pass by simply stop, at a safe distance,, say at least double his length, be smart,,triple his length and go silent and still. He 'see's' heat and movement only. so IF you move,,move away.
Make no mistake here, he can see you standing there all sweating, gulping air.

If you remain perfectly still and silent he will uncoil and go on his way.