I remember driving a ~1960 automatic Jag that had a 'traffic brake'.  With
the engine running, selector in drive, pressure in the brake line and the
vehicle stationary you could take your foot off the brake pedal because a
simple hydrolic logic circuit would hold the brakes on.  Touching the
accelerator released the system.

I loved it - 40 years ago.  Its a great idea that is sorely missed today,
especially with 40+ watts of high level brake lights in your face as you
creep through a traffic jam.  I wonder if some EE could perhaps develop a
PIC circuit to reproduce it ???  And/or include it as part of an anti-theft
system ?

Bye.

-----Original Message-----
From: Alan B. Pearce [mailto:A.B.Pearce@RL.AC.UK]
Sent: Wednesday, 24 October 2001 19:16
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Practical car theft schemes


>To prevent it from being towed, I have always liked the valve in the brake
>line trick.  Apply the brake very hard, then the valve closes locking the
>brakes on.  Can't tow it if it doesn't roll.  This will also prevent it
>from being driven.

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