Re: [SystemSafety] Small but useful Detail on Road Stopping Distances

From: David Haworth < >
Date: Thu, 30 Jul 2015 08:18:59 +0200


On 2015-07-29 15:58:35 +0200, Peter Bernard Ladkin wrote:
> The traffic law in Germany stipulates a reaction time of 1 second.

The "halber Tacho"* rule for driving on the Autobahn approximates to a 2 second reaction time (since your safe distance behind another car doing the same speed is just your reaction time, all other things being equal). Or one second plus "engineering tolerance" ;-)

Incidentally, the UK has a 2 second guideline for the same purpose. And they used to have a snappy slogan: "Only a fool breaks the 2-second rule". One advantage of this over the "halber Tacho" rule is that it is easier to apply in practice.


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systemsafety_at_xxxxxx Received on Thu Jul 30 2015 - 08:19:34 CEST

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