Back in the 1960's when road construction was underway and diversion of lanes was necessary, at night the spherical black kerosine lamps the size of bowling balls were still everywhere the traffic cones were during the day.

Modern rechargeable electricial markers that could last all night were not common at all.

Rows of bombs with a few inches of raw sooty flame coming from a wick where the fuse would be.

Drive your Model T or Edsel carefully between the lines of flickering fire.

Plus the Pink Panther cartoons had an associated subject line occasionally featuring a mad French terrorist bomber often carrying one of the round black bombs.

This was basically ridiculing the bombers that had been in the news terrorizing them.

Both were enjoyed by American kids as much as domestic cartoons, even though they were basically like silent movies, intentionally featuring no actual dialog, intended for international consumption without need for translation.

All the American villians had the same kind of bombs anyway.