Sorry if this is a repost, although I doubt it. Can't hurt.
As part of our Confuse-a-CAD-Monkey policy, we change our standards on every project. We had a custom linetype for silt fence years ago, which looked something like this:
Unfortunately, every one of those pointy bits had to be drawn by hand, or at least copied, along an erratic border. I came up with a dynamic block (my first), but it was kinda clunky. Then we switched to a different linetype.
Now we've switched back. I came up with a custom shape and put it in a complex linetype. If anyone wants it, here's the shape definition (in my.shp):
*001,5,SILT
018,011,01F,018,0
Compile it as my.shx and put this in a .lin file.
*SILTFENCE, silt fence -^--^--^--^-
A,.25,[sILT,my.shx,s=.1],.25