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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: power supply discharge [OT]
Date: Fri, 11 Oct 2024 07:55:46 -0700
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On Fri, 11 Oct 2024 10:13:17 +0100, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

>john larkin <JL@gct.com> wrote:
>
>[...]> 
>> Just like a car in hill country. Power up a slope and fry the brakes
>> coming down.
>> 
>> We have runaway truck lanes here, a side road filled with gravel. A
>> big loaded semi doesn't have much engine braking and then smokes the
>> brakes.
>
>We have one a few miles away.  It is at the bottom of a series of zigzag
>bends and on the *inside* of the last bend.  Any runaway lorry would
>have to negotiate the bends in order to to reach it and then turn
>through two sharp 90-degree bends to enter it.
>
>It seems to be mostly used by picnickers who have reasoned that the
>chance of any runaway reaching them is minimal.

From the crest near Truckee to Auburn CA, there's a downslope of about
6200 feet over about 50 miles. Trucks tend to smoke their brakes going
down the steeper parts of that. The runaway truck ramps are tangent
sidings off the right side of the highway that still slope down but
are filled with deep gravel, terminated by a big pile of dirt. Youtube
has some great stop videos.

A loaded semi must store a lot of joules.

https://www.dropbox.com/scl/fi/xfxuch6qxtz44egay3zi4/Exit201.jpg?rlkey=7s2rjii6zjzwk6r5au4uxygk9&raw=1