And in context of the post of HGV braking is !!!..…
I think the first question is
If something falls off the back of a lorry travelling along a road at speed how far will to travel before stopping?
If we knew that we can see how far behind a vehicle needs to be.
If it is a cylinder across the bed that falls, it might well roll down the road it almost the same speed as the truck.
If that same cylinder was loaded along the length of the truck and if one end embedded itself in the road surface might it stop almost instantly or end over once or twice?
So a vehicle needs to travel at the stopping plus thinking/rection distance behind the vehicle in front.
I once lost a cylinder that was loaded lengthwise on a flatbed. It didn’t dig in! I watched mesmerised as it rapidly overtook me and created it own exit off the motorway near Gloucester! 
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Really? Do you mean the space from the veh infront is based on your stopping distance and your reaction time? That assumes the debris decelerates at least as swiftly as your veh. Perhaps, if it’s an option you base it on the min distance to make a lane change!
There is my assumption. Followed by a ?
Whether or not not assumption is valid? I don’t know.
Que? I think its in the correct context of the thread, I can’t tell if you’re suggesting it is not contextual?
I can easily believe that happening, as a steel cylinder slides along.
I can also imagine that a cylinder of a different length would end over and stop much more rapidly, possibly even digging into tarmac and stopping very quickly.
Yeah mine was back in the late 80’s where cyclinders weren’t so robustly designed so this one passed me after knocking the valve off and accelerating like a top fuel dragster. Thank God the motorway was empty.
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Grief!
In a cartoon that is funny, in real life frightening.
Frightening can be funny, from a distance, when you’re not involved…
I use this for my Class 2 (gases) segment of ADR. Pity about the American voice over and imperial measurements.
I was in my twenties (relatively) inexperienced and made a potentially fatal error when strapping the “flat topped pyramid “ of cylinders. Namely I didn’t put (I don’t know the name) the piece of timber with the cylinder cut outs across the top before strapping up. This left the middle cylinder pretty much loose. Even worse the cylinders were NH3 anhydrous ammonia. Luckily nobody was hurt and I got away with it simply by not reporting it and hoping for the best. Nowadays I’d probably be internet famous.
Lovely stuff, toxic and corrosive too.
You are now. 
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only that the OP was asking about an HGVs and the photo seems to show a car into the rear of an HGV! And no other explanation.
Took the exit slip all by itself 
OK, my familiarity with that incident obviously isn’t as common as I thought it was.
[quote="maoster
. Nowadays I’d probably be internet famous.
[/quote]
Ever since that photo of you and Robroy got posted!
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I’ll have you know that picture was voted X hamsters most “I touch myself “ picture of 2023.
I still have the trophy 