Those are reasonably surmountable problems....
On the one-solid-and-one-dashed option, they could be two separate Polylines, one continuous and one offset from it with the striping linetype, because there isn't the problem of the synchronizing of the dashes between the two of them. There would still be two Polylines involved, as in Bill's suggestion, but both visible.
On the making of the linetype and the relative lengths of the dashes and the gaps, that's easy enough to handle with the on and off parts of the linetype definition, though of course Bill's approach couldn't be done in *one* linetype. His image is probably just from one of the Dashed or Hidden families, but the principle would work for something with appropriately different dash and gap sizes.
Another possibility is shown in the attached drawing. It's drawn with Blocks, but would be done with Shapes and a complex linetype incorporating them. The curves are slightly kinked [made up of short straight segments] if you zoom in far enough, but would probably look fine at plotted scales, and road striping would probably never have a tight-enough radius that it would be obvious. But you'd need to be careful about the ends, since any length overage would show as a continuous line down the center.
And there's a limit to the number of element definitions in a complex linetype, so you might need to lengthen the shape to get the right road-stripe dash length [I have no idea what standards there may be]. For the one-side-continuous option, you'd need two different shapes, one for the double-line segments and one for where the gaps are in one side. And they'd probably need to be even longer to get the whole sequence into the linetype-definition-elements limit.
But at least it would be *one* Polyline instead of two, so it wouldn't be as complicated to adjust its path, you wouldn't need to worry about draw order, etc.
--
Kent Cooper
None wrote...
....Not sure how one would go about making a linetype of that and then there's the problem of having one solid line and on the opposite side, a dashed line. Also, as I see it from my back yard (and NO, I'm not going out to measure anything) the one line down the center of the street at the end of our house appears to be 8 feet long with a spacing of 16 feet between lines. ....
Kent Cooper, AIA