I've noticed that when driving at night and you come upon an emergency
vehicle, say a road repair, or telephone pole and there is a truck
there with a emergency light bar - yellowy flashing lights on a, maybe
18 - 24 inch bar across the width of the truck - that people seem to
slow down immediately.
Another thing that seems to be noticed if those "road flares". they
had a nail on one end and you stabbed them into the pavement and than
ignited them.
A vehicle burning on the edge of the road also attracts a lot of
notice. I've seen cars stopped for a hundred yards in both direction.
{people even get out of their cars and walk, imagine that "Walk", to
get a closer view.
But I suppose that the weak point is that these things are "old Hat"
and you will never get a mention of the Internet if you "discover" one
of these.
But you know, a few rags and a broomstick and a can of kerosene and a
cigarette lighter could probably get one a lot of space on the highway
:-)
(on the other hand, in the U.S. it might get one arrested for
contaminating the atmosphere :-)
--
cheers,
John B.