[SystemSafety] Small but useful Detail on Road Stopping Distances

[David Haworth]

Peter,

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" ;-)

* For people not familiar with the German guidelines, you take your
speed in km/h, divide by two, and that gives you your "safe" distance
in metres.

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.

Cheers,
Dave

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