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

From: Mike Ellims < >
Date: Thu, 30 Jul 2015 18:47:14 +0100


I find it simplest to note when the car in front passes a fixed object and count one elephant, two elephant, three elephant.

-----Original Message-----
From: systemsafety-bounces_at_xxxxxx [mailto:systemsafety-bounces_at_xxxxxx Steve Tockey
Sent: 30 July 2015 15:38
To: David Haworth; Peter Bernard Ladkin
Cc: 'The System Safety List'
Subject: Re: [SystemSafety] Small but useful Detail on Road Stopping Distances

We were taught (in the US), "One car-length per 10 MPH" as in if you're going 50 MPH then leave 5 car lengths distance between your car and the one in front.

Cheers,

-----Original Message-----
From: <systemsafety-bounces_at_xxxxxx David Haworth <david.haworth_at_xxxxxx Organization: Elektrobit Automotive GmbH Date: Wednesday, July 29, 2015 11:18 PM
To: Peter Bernard Ladkin <ladkin_at_xxxxxx Cc: 'The System Safety List' <systemsafety_at_xxxxxx Subject: Re: [SystemSafety] Small but useful Detail on Road Stopping Distances

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" ;-)

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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