Changing to aero wheels

Gomev said:

But the lorry will already be in the process of stopping, which is happening during your reaction time.

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I know but not enough for an impact, provided the gap between car and lorry is greater than the distance travelled in the reaction time. The car will stop quicker than the lorry, 50m* as opposed to 120m*, say, so from the car's point there would be an initial rapid closing of the gap - but not enough for a collision - then the lorry would appear to accelerate away from the car even though both are hard braking, hopefully ... in theory

57mph is approx 25m per second, so if reaction time is =1, or <1, then no collision would occur, if gap is 25m or above, as in the 3rd option in the diagram above, 15m would be pushing it unless you had very quick reactions.

Perhaps I got my maths/physics wrong**, but I've thought about this a lot as I do slipstream on motorway often.

* figures I got online, though there is lots of conflicting data.
** maybe braking is not linear, for example.

Tommy said:

I know but not enough for an impact, provided the gap between car and lorry is greater than the distance travelled in the reaction time. The car will stop quicker than the lorry,

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Provided of course the lorry doesn't have help in stopping because it has run into something else like another lorry. After all we've never seen multiple vehicle pileups have we?

I actually witnessed one from the side barely 20 meters from the road on the A14 near Bar Hill. I was having a coffee in the cafe sat at a window next to the road when I heard a screech and a loud bang which repeated many times as I watched. Frightening, and so many wrecked cars and lorries. Fortunately I discovered later no fatalities.
Reaction time and stopping quicker than a lorry may work in theory but didn't always work in practice.

Gomev said:

Provided of course the lorry doesn't have help in stopping because it has run into something else like another lorry. After all we've never seen multiple vehicle pileups have we?

I actually witnessed one from the side barely 20 meters from the road on the A14 near Bar Hill. I was having a coffee in the cafe sat at a window next to the road when I heard a screech and a loud bang which repeated many times as I watched. Frightening, and so many wrecked cars and lorries. Fortunately I discovered later no fatalities.
Reaction time and stopping quicker than a lorry may work in theory but didn't always work in practice.

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Yes, you're right, I hadn't thought of that. Additional stopping force on the lorry would screw up my "theoretical" example above. I'll climb down on this one, complete u-turn for me ... best to be safe after all, for everyone's sake and leave the right gap ...

Back to the wheel question. I wondered if there was any aero hub caps available like Tesla use? Could be a more reasonable cost than whole wheels?

ayres said:

Back to the wheel question. I wondered if there was any aero hub caps available like Tesla use? Could be a more reasonable cost than whole wheels?

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Don’t think it will be worth your while, the difference having them on on a Tesla works out about £2.75 cheaper per 10k miles