On Mar 25, 8:54 am, wrote:
On 24 Mar, 20:49, "mark" wrote:

The warning says something like: Will come to a Sudden Stop at the Red
Line.

How does that work?

mark

Inductance loop buried in the ground at red line.Puts the brakes on.
Assuming you`re talking about shopping trolleys but just forgot to
mention it?

No he's talking about Supermarket Trolleys like the heading says